[MUD-Dev] The Case For Game Design Patterns

J C Lawrence claw at kanga.nu
Tue Jun 18 10:14:34 New Zealand Standard Time 2002


From:

  http://www.gamasutra.com/features/20020313/kreimeier_pfv.htm

Hopefully this shouldn't be new to anyone here.  However it would be
useful to add the various terms to our lexicons and start using them
analytically.

--<cut>--
The Case For Game Design Patterns

By Bernd Kreimeier
March 13, 2002
URL: http://www.gamasutra.com/features/20020313/kreimeier_01.htm

Game design, like any other profession, requires a formal means to
document, discuss, and plan. Over the past decades, the designer
community could refer to a steadily growing body of past computer games
for ideas and inspiration. Knowledge was also extracted from the
analysis of board games and other classical games, and from the rigorous
formal analysis found in mathematical game theory.

However, while knowledge about computer games has grown rapidly, little
progress has made to document our individual experiences and knowledge -
documentation that is mandatory if the game design profession is to
advance. Game design needs a shared vocabulary to name the objects and
structures we are creating and shaping, and a set of rules to express
how these building blocks fit together.

This article proposes to adopt a pattern formalism for game design,
based on the work of Christopher Alexander. Alexandrian patterns are
simple collections of reusable solutions to solve recurring
problems. Doug Church's "Formal Abstract Design Tools" [11] or Hal
Barwood's "400 Design Rules" [6,7,18] have the same objective: to
establish a formal means of describing, sharing and expanding knowledge
about game design.

>From the very first interactive computer games, game designers have
worked around this deficiency by relying on techniques and tools
borrowed from other, older media -- predominantly tools for describing
narrative media like cinematography, scriptwriting and
storytelling. Computer games are a visual medium, and game designers are
increasingly relying on design techniques developed for movies - to the
detriment of efforts to identify methods genuinely suited for game
design. The discussion of narrative techniques has come to dominate the
discourse on game design, almost extinguishing alternatives.

If the techniques borrowed from other media were sufficient to express
and address game design issues, there would be no need to search for
alternatives. However, the metaphors and devices borrowed from narrative
media are usually insufficient (or even inadequate) to capture the
essence of the interactive game medium. The community is aware of this
[12], although the response is often an attempt to reconcile the
contradiction by redefining the term "narrative" [24]. Taken to the
extreme of an artificial playwright [23], this constitutes proposing a
technological solution to a conceptual problem. The real issue is not
the shortcomings of narrative techniques with respect to their utility
in game design, but the lack of techniques genuinely suited for
interactive media.

The game design pattern method proposed here is concerned with content
patterns, as opposed to software engineering patterns [19],
specializations of which that have been proposed for game programming
[33,20]. Similarly, process patterns to organize and manage game
development projects (such patterns could be extracted from [17,28]) are
beyond the scope of this article.

What Are Patterns?

In a nutshell, patterns are simply conventions for describing and
documenting recurring design decisions within a given context, be it
game design or software engineering. Specific patterns are the result of
applying this method consistently, leading to collections of design
patterns which have been assigned a name and are documented by an
anecdotal or abstract description. Pattern methods provide semi-formal
tools for problem domains in which rigorously formal methods cannot
easily be applied, or are simply not available or even conceivable.

Patterns are traditionally expressions of problem-oriented thinking. The
seminal book by Gamma et al., Design Patterns: Elements of Reusable
Object-Oriented Software, quotes Alexander [3]: "Each pattern describes
a problem which occurs over and over again in our environment, and then
describes the core of a solution to that problem, in such a way that can
you can use this solution a million times over, without ever doing it
the same way twice." There can be several alternative solutions to a
given problem, each one defining its own pattern, but the combination of
problem statement and solution proposal is the essence of any
Alexandrian pattern.

A game design pattern collection would provide a shared design
vocabulary that allows experienced designers to:

   o communicate efficiently with each other, with less experienced
   designers, and with members of other professions (like software
   engineers and game coders)

   o document their insights, organizing individual experience as
   written knowledge

   o analyze their own design as well as the designs of others, e.g. for
   purposes of comparative criticism, re-engineering, or maintenance

It is important to distinguish between pattern-based methods, which are
very generic and general, and specific pattern collections created for a
given purpose. The decision to use patterns merely determines form, not
content. The conventions of any pattern template do not guarantee (or
prohibit) that useful patterns will be found and documented. Pattern
methods are simply a successful way to express existing knowledge.

A Pattern Template

Pattern templates typically contain these four essential elements:

   1.  Name. "Naming a pattern immediately increases our design
   vocabulary. It lets us design at a higher level of
   abstraction". Names have to be mnemonic and evocative, but the
   connotations also pose problems. "Also Known As", frequently part of
   pattern templates, is actually an indication of a naming problem:
   "Finding good names has been one of the hardest parts of developing
   our catalog" (again, Erich Gamma et al.).

   2.  Problem. This describes the problem, including its inherent
   trade-offs and the context in which the problem occurs. The
   description of the problem implies a goal that we want to accomplish,
   and the obstacles we encounter when we attempt to do so.

   3.  Solution. A description of a general arrangement of entities and
   mechanisms that can be used to solve the problem. This is not a
   particular design or concrete implementation, but an abstract
   structure that describes an entire family of solutions that are
   essentially the same.

   4.  Consequences. Each solution has its own trade offs and
   consequences. Solutions can, in turn, cause or amplify other
   problems. The costs and benefits of a solution should be understood
   and compared against those of alternatives before making a design
   decision. Around this essential core, pattern templates often add
   other elements, or subdivide a core element.
     
     Gamma et.al. uses Name - Intent - Aliases - Motivation -
     Applicability - Structure - Participants - Collaborations -
     Consequences - Implementation - Sample - Known Uses - Related
     Patterns . Meszaros and Doble describe pattern writing itself in
     patterns organized as Title - Problem - Context - Forces - Solution
     - Indications - Resulting Context - Related Patterns - Examples -
     Samples - Rationale - Aliases - Acknowledgements [25]. Alexander
     et. al. use Name - Example as Picture - Context within larger
     patterns - Problem - Solution - Solution as Diagram - Relation to
     smaller patterns [3]. Ultimately, the details of the format chosen
     do not matter as much as the fact that one format has been elected
     and is used consistently (for more details on how to write
     patterns, see [31,34,5]).

Pattern Examples

To show the method in action, let's look at some pattern candidates. The
following examples are admittedly very simple, and weren't selected
necessarily for their particular relevance to game design.

+------------------------------------------------------------------------------+
|PROXY                                                                         |
|                                                                              |
|          Problem: It might not be possible or desirable to require that      |
|     a game action is applied to the target object directly. In other         |
|     words, we have to avoid proximity to or collision with the ultimate      |
|     target of a given action.                                                |
|                                                                              |
|     Solution: Introduce another entity (object) that is used as a proxy,     |
|     standing in for the target object. The proxy can be placed and moved     |
|     independently of the target object or objects. The restrictions that     |
|     apply to the target(s) do not by default apply to the                    |
|     proxy. Multiple proxies can be used for the same target or targets.      |
|                                                                              |
|     Consequence: The link between the proxy and the actual target has to     |
|     be communicated to the player, if the player is supposed to exploit      |
|     this connection and indirection. Restrictions on placement of proxy      |
|     and target with respect to player field of view, and restrictions on     |
|     player view control might apply, to ensure that the player perceives     |
|     the effect on the target.                                                |
|                                                                              |
|     Examples: Munch's Oddyssee has several proxies for the player            |
|     characters: the possession orb which enables Abe to take over other      |
|     game characters (thus turning them into proxies), and the Snoozer        |
|     robot and H-Crane, which served as proxies for Munch. One benefit of     |
|     player character proxies is that of a safe death: loosing a proxy        |
|     does not end the game. Buttons/Switches/Levers that open doors or        |
|     start/stop machinery are often placed in different locations,            |
|     instead of being part of the target object. In these cases, the          |
|     designer wants to separate trigger from target to permit more            |
|     elaborate puzzles. Half-Life's final boss had a vulnerable location      |
|     inside its head. That vulnerable spot could be considered a proxy        |
|     for the entire (invulnerable) boss. As a second order vulnerability,     |
|     the boss was dependent on three crystals that supplied energy for        |
|     healing and attack. Attacking the crystals destroyed them, thus          |
|     permitting effective attacks on the boss monster itself.                 |
+------------------------------------------------------------------------------+

PROXY was chosen to illustrate potential problems in using the same name
for different patterns existing in different contexts. There is a
software engineering pattern with the same name, introduced by Gamma et
al. However, there is no meaningful connection between the two
concepts. On the other hand, in some cases a given pattern language
might translate into a sensible OOP implementation hierarchy, if there
is a correspondence between the purpose of a given game design entity
within the design context, and its implementation in the software that
constitutes the game engine.

+------------------------------------------------------------------------------+
|PREDICTABLE CONSEQUENCE                                                       |
|                                                                              |
|          Problem: The player has to perceive failure as a consequence of     |
|     her mistakes, not as a random or predestined event unrelated to, and     |
|     unavoidable by, any reasonable choice of actions on her part.            |
|                                                                              |
|     Solution: The player cannot take a meaningful decision to act (or        |
|     not to act) if the result of a possible action can not be                |
|     anticipated. A meaningful player decision is an informed decision:       |
|     she has to be able to guess the result of her action before she ever     |
|     takes it. Choose game mechanisms that communicate predictable            |
|     behavior by visual appearance relying on knowledge the player            |
|     already has (either from real world experience, or from experience       |
|     with other games, or from experience with preceding parts of your        |
|     game). Do not break consistency of your visual language, i.e. make       |
|     sure that objects that behave identical look identical.                  |
|                                                                              |
|     Consequence: It is no longer possible to implement surprises that        |
|     are impossible to anticipate. The player might rely on the               |
|     out-of-context assurance to anticipate the designer's ambush, and        |
|     either outwit the designer, or find herself locked into performing       |
|     an action against her better judgment as the designer has prevented      |
|     alternative courses of action. Ultimately, the designer might            |
|     arrange for actions that the informed player will never perform, as      |
|     they are predictably to her disadvantage. The designer might have to     |
|     go to considerable length to communicate the rules that govern the       |
|     outcome of actions, to the player. The design might be biased            |
|     towards using mechanisms resembling real world objects, to minimize      |
|     the need for explanations. A lack of uncertainty on the player's         |
|     side makes the game more transparent, potentially removing the need      |
|     for exploration and experimentation. Ultimately, the need for            |
|     Predictable Consequence is determined by the need for backtracking       |
|     (severity of failure) and costs of backtracking (latency between         |
|     choice and consequence, see also behavioral science on timing            |
|     issues). Another possible consequence is that the design might have      |
|     to restrict itself to a smaller set of player actions, in order to       |
|     be able to enable them consistently throughout the game                  |
|     world. Actions only available once or in a very few locations do not     |
|     amortize the costs of communication and teaching/learning on the         |
|     designer's/player's part. The design might also have to exaggerate       |
|     the differences between distinct objects to avoid ambiguities. Any       |
|     kind of variation or range has to follow rules that can easily be        |
|     observed and complied with.                                              |
|                                                                              |
|     Examples: Doug Church's article relied on Mario 64 as the textbook       |
|     example [11] of predictable consequence. This pattern could be           |
|     applied to any game with a consistent physics approximation, such        |
|     those exhibited by bouncing grenades in FPS games. Other examples        |
|     include crates and barrels that are marked as explosive actually         |
|     explode, fireballs that hurt a player when they hit, burning fire,       |
|     water that drowns if you do not swim, and lava which                     |
|     kills. Counter-examples are plentiful: switches and buttons that say     |
|     "Push Me" to unleash a necessary ambush (an ambush that also opens       |
|     the only way to move on) anticipated only as such. Openings in which     |
|     to jump without knowing what is on the other side such as those          |
|     found in Opposing Force and Ico. This is often a necessity imposed       |
|     by the level partition/transition mechanism the engine uses.             |
|                                                                              |
|     References: Doug Church introduced the concept of                        |
|     perceived/perceivable consequence [11], which he uses also do            |
|     describe predictable outcomes. There is a difference between the         |
|     requirement for immediate feedback that the player can connect to        |
|     her actions, and the requirement that the player has to have a           |
|     chance to anticipate the likely outcome of her action. This pattern      |
|     was derived from the latter, the former would require another            |
|     pattern.                                                                 |
+------------------------------------------------------------------------------+

PREDICTABLE CONSEQUENCE is my rewrite of FADT "Perceivable Consequence"
introduced by Doug Church (see [11] for the original description). Aside
from changes to the description itself to refine its meaning (as I
perceived it), this pattern candidate illustrates that FADTs can
expressed as patterns.

+------------------------------------------------------------------------------+
|PAPER-ROCK-SCISSORS                                                           |
|                                                                              |
|          Problem: Avoid a dominant strategy that makes player decisions      |
|     a trivial choice.                                                        |
|                                                                              |
|     Solution: Introduce nontransitive relationships within a set of          |
|     alternatives, as in the game of paper-rock-scissors.                     |
|                                                                              |
|     Consequence: The player is no longer able to find a single strategy      |
|     that will be optimal in all situations and under all                     |
|     circumstances. She has to revisit her decisions, and, depending on       |
|     the constraints imposed by the game, adjust to changing situations,      |
|     or suffer the consequences of an earlier decision.                       |
|                                                                              |
|     Examples: The example given by Andrew Rollings is the set of             |
|     warrior-barbarian-archer from the Dave and Barry Murray game The         |
|     Ancient Art of War (Broderbund 1984). He also describes Quake's          |
|     weapon/monster relations in similar terms: Nailgun beats shambler,       |
|     shambler beats rocket launcher, rocket launcher beats zombie, zombie     |
|     beats nailgun [28].                                                      |
|                                                                              |
|     References: Chris Crawford (see "Triangularity" in [15]) provided        |
|     the first explicit description of the use of nontransitive               |
|     relationships. Andrew Rollings' discussion of examples uses game         |
|     theory including detailed payoff, as well as informal fictional          |
|     designer dialogs.                                                        |
+------------------------------------------------------------------------------+

PAPER-ROCK-SCISSORS is a recurring game design device that may have been
the very first to be semi-formally described. It can also be presented
as a pattern. There is no new information in this rewrite; the existing
knowledge has merely been reorganized to match the other examples. The
pattern could be extended to include a description of payoff matrices
and examples for sets larger than three (see [28] for such a
discussion), but even the minimal description captures its essence.

+------------------------------------------------------------------------------+
|PRIVILEGED MOVE                                                               |
|                                                                              |
|          Problem: Sometimes a given game entity cannot be permitted to       |
|     interfere with others, or other entities cannot be permitted to          |
|     interfere with it.                                                       |
|                                                                              |
|     Solution: Introducing exclusive moves and locations separates and        |
|     protects game entities. These exclusive moves and locations cannot       |
|     be entered or left without being able to perform the respective          |
|     privileged move. By introducing different, separate spaces or media,     |
|     the game environment is broken down into distinct areas, which can       |
|     serve e.g. as safe zones or safe passages.                               |
|                                                                              |
|     Consequence: Depending on the implementation, this can be a very         |
|     heavy-handed way to ensure protection. Unless protection is              |
|     implemented in a way that is at the player's disposal (a door that       |
|     only she can open and close), the player might perceive the              |
|     constraint as annoyance and disappointment. If the restriction is        |
|     meant to be temporary, the mechanism to allow it to be lifted has to     |
|     be communicated to the player, and initiated by her.                     |
|                                                                              |
|     Examples: In DOOM, monsters could traverse acid pools, but the           |
|     player could only at the expense of damage that quickly turned to be     |
|     lethal. In Half-Life and Halo, enemy soldiers can be dropped from        |
|     flying vehicles, a transportation mechanism not available to the         |
|     player, and impossible to interfere with. Half-Life also had a           |
|     spider-like boss that was capable of breaking through its own nets,      |
|     which blocked the player's way until she forced the monster to           |
|     retreat. In Thief, the player traverses rooftops in relative safety,     |
|     permitting preview and outlook on the level bottom. In Ico, the          |
|     ghostly opponents traverse the world in a different dimension, and       |
|     emerge from portals without apparent restriction. In Munch's             |
|     Oddyssee, water was inaccessible to enemies, providing one player        |
|     character a privileged swim move and safe passage (in the absence of     |
|     snipers and mines). In many games, water enemies are in turn             |
|     restricted to that medium (e.g. Quake, Half-Life). In many games         |
|     flying opponents (e.g. the harpies in Heretic 2) can perform moves       |
|     the player cannot, and thus enjoy some amount of safety.                 |
+------------------------------------------------------------------------------+

PRIVILEGED MOVE is a pattern proposal for a mechanism rarely discussed,
but frequently used for a multitude of purposes. A single solution can
solve or address multiple problems; a situation that is not clearly
addressed in Alexandrian pattern languages that emphasize the
problem-oriented aspect of pattern use. PRIVILEGED MOVE is also a very
close relative of FILTER. This example set is by no means
comprehensive. As Gamma et al. wistfully remark: "Finding patterns is
much easier than describing them."

+------------------------------------------------------------------------------+
|FILTER                                                                        |
|                                                                              |
|          Problem: If the player is given means to create new game            |
|     objects, and/or new combination of existing objects, and/or move         |
|     game objects arbitrarily, the resulting complexity might become          |
|     overwhelming for the designer.                                           |
|                                                                              |
|     Solution: Limit local complexity by filtering, thus creating             |
|     smaller, clearly defined subsets that can be dealt with.                 |
|                                                                              |
|     Consequence: Player freedom is restricted by implicit or explicit        |
|     means. Accidental filtering can lead to game situations that the         |
|     player cannot solve. Ideally, the filtering is obvious to the            |
|     player, and inherent part of the game world. FILTER can be an            |
|     intended consequence or unintended side effect of PRIVILEGED MOVE.       |
|                                                                              |
|     Examples: FILTER as a means of dealing with combinatorial complexity     |
|     of possible game states is extracted from Jon Blossom's postmortem       |
|     of DroidWorks ([9]). Quote: "Our level designers [..] could never be     |
|     entirely sure what kind of droid would be walking into their rooms       |
|     [...] In many cases, they created ingenious physical filtering           |
|     mechanisms that would guarantee only certain types of droids went        |
|     beyond certain points in the level: A steep hill would weed out          |
|     biped droids in favor of droids with tractor treads, a chasm would       |
|     weed out wheeled droids that couldn't jump, a narrow canyon would        |
|     weed out wide droids, and a short door would weed out tall               |
|     droids. The designers used the terrain leading up to key puzzles to      |
|     reduce the complexity of the puzzle itself [...]"                        |
+------------------------------------------------------------------------------+

 

+------------------------------------------------------------------------------+
|WEENIE                                                                        |
|                                                                              |
|          Problem: Players might loose their sense of direction with          |
|     respect to how the game world unfolds. This is a particular problem      |
|     with player-driven scripting proceeding in lockstep with player          |
|     actions.                                                                 |
|                                                                              |
|     Solution: The game has to establish clear leads that communicate to      |
|     the player where to go, and what actions to attempt once there.          |
|                                                                              |
|     Consequence: The player will over time come to depend on the level       |
|     of guidance, and will be confused if this guidance is dropped or         |
|     omitted, which introduces a bias towards WEENIE CHAIN. Depending on      |
|     the rigidity of the guidance mechanisms, players might become aware      |
|     the out-of-game agenda behind the in-game setups.                        |
|                                                                              |
|     Examples: On occasion this has been called the "carrot on a stick"       |
|     approach to level design [8]. Stephen Clarke-Wilson [13] explains:       |
|     "This somewhat bizarre term was coined by Walt Disney, who suggested     |
|     that when designing massive 3D environments (theme parks), it was        |
|     necessary to lead visitors through the environment the same way one      |
|     trains a dog-by holding a wiener and leading the dog by the              |
|     nose. Obvious weenies at Disneyland are Sleeping Beauty's Castle,        |
|     which encourages guests to travel from the main entrance to the          |
|     central hub; the former Rocket Jets, which encourage guests to           |
|     explore Tomorrowland; the Mark Twain Steamship and dock, which           |
|     encourage guests to explore Frontierland; and the King Arthur            |
|     Carousel, which encourages guests to walk over the castle moat and       |
|     into Fantasyland. [...] Your 3D VR environment needs to have             |
|     standout landmarks so that it's easy to navigate without a map. The      |
|     best games, which have typically been designed with very limited         |
|     graphics, always save a few graphics to denote special and               |
|     interesting things that should be investigated." Alternative means       |
|     to communicate to the player the next proposed or mandatory step are     |
|     explicit messages delivered by NPCs, or brief camera cuts that draw      |
|     attention to doors opening in nearby locations, like that used in        |
|     Munch's Oddyssee. Cliff Bleszinksi describes as the most subtle and      |
|     always present WEENIE the incentive of seeing a new area: the player     |
|     is always inclined to move from "been here, done this" into unknown      |
|     territory [8].                                                           |
+------------------------------------------------------------------------------+

 

+------------------------------------------------------------------------------+
|WEENIE CHAIN                                                                  |
|                                                                              |
|          Problem: The player can lose sense of direction in the absence      |
|     of clear indicators of where to go next. This is particularly a          |
|     problem in games with large or non-linear environments that do not       |
|     rely on rails or cut-offs to constrain player movement, or employ        |
|     "revisiting" of areas [8].                                               |
|                                                                              |
|     Solution: Create an uninterrupted chain of WEENIEs, with each link       |
|     of the chain clearly perceivable from its predecessor, guiding the       |
|     player from start to finish.                                             |
|                                                                              |
|     Consequence: WEENIE CHAIN might be limited in employing branches or      |
|     otherwise introduce ambiguity or player choice. Enforced, WEENIE         |
|     CHAIN might resemble a rail.                                             |
|                                                                              |
|     Examples: Noah Falstein refers to Indiana Jones and the Fate of          |
|     Atlantis as an example of how to establish a chain of clear player       |
|     goals using messenger NPCs [18]. His other examples are Super Mario      |
|     64 and its use of signs and NPCs, as well as Halo. Munch's Oddyssee      |
|     also uses signs, as well as a Shaman NPC for initial guidance.           |
+------------------------------------------------------------------------------+

Pattern candidates can be harvested from many sources. For example, the
pattern FILTER is taken verbatim from a game postmortem. WEENIE is taken
from a discussion of theme parks and techniques of environmental
storytelling, and has been presented under a different name in lectures
on level design. WEENIE also is the foundation of WEENIE CHAIN,
illustrating pattern dependency, composition, and hierarchy.

Once you start looking for patterns, you start noticing them
everywhere. Erich Gamma et al. point out that whether they are aware of
it or not, novelists and playwrights already use patterns. Many
"narrative devices" (see e.g. [32]) could also be described using a
pattern template.

Sometimes the need to differentiate patterns on distinct levels of
abstraction leads to different labels: "One person's pattern can be
another person's primitive building block" (from [19]). Alexander et
al. present a total of 253 patterns, subdivided into three sets for
"Towns, Buildings and Construction" [3]. Preferences regarding the
virtues of a given purpose might apply: pattern are just recipes, means
not ends, and disagreement on the ends is beyond the scope of a
pattern. Designers might also have different views on the quality of a
given solution: one person's pattern might well be another's
"anti-pattern" -- a recurring example of a bad design decision. Ideally,
the pattern description itself is just a candid summary of cause and
effect, describing one way to reach a given objective.

Alexandrian patterns are not unknown to game developers. Many
programmers are familiar with Gamma's concept of software design
patterns. Will Wright of Maxis credits the same book as the original
inspiration for The Sims, and refers to Christopher Alexander's works
(namely [1]). Steven Chen and Duncan Brown, former level designers at
LucasArts, refer level designers to the 253 Alexandrian patterns merely
as a guideline to create "meaningful environments" [10].

Instead, game developers strive to develop their own forms and
templates. The Formal Abstract Design Tools (FADTs) proposed by Doug
Church can easily be rewritten to fit the canonical pattern
template. Another recent attempt to document game design knowledge in
semi-formal ways is "The 400 Project" by Hal Barwood and Noah Falstein,
is a project to collect proven game design rules and techniques. This
400 Project dates back to a GDC 2001 lecture by Hal Barwood, in which he
also presented four examples.

Their effort has now spawned a column in Game Developer magazine, in
which Noah Falstein introduced the rule "Provide clear short-term goals"
as the opening example. The 400 Project uses a five-part template:
Imperative Statement - Domain of Application - Dominated Rules -
Dominating Rules - Examples Aliases (see [18] for details). The concept
of dominance (that some rules take precedence over others, and might in
turn be trumped themselves) is absent from Alexandrian patterns. An
Alexandrian pattern simply lists one possible solution to a given
problem, acknowledging that other solutions might exist. Alexander sees
each pattern as a recipe that strives to balance competing imperatives
and conflicting forces in order to achieve the best possible results
with respect to a specific objective. The decision to use a given
pattern will also depend on whether there are multiple objectives to
fulfill or when aside effects of applying a given solution, influence
the. Falstein's rules appear more rigid, implying that all games have
the same goals, and the same concerns. The names of the rules in the 400
Project are imperative statements, like Provide clear short-term goals,
and their description contains only the solution part of a pattern. The
problem to be solved by the pattern is merely implied or presumed
obvious in this revision of the rules. WEENIE, as well as WEENIE CHAIN,
capture parts of Provide clear short-term goals but also explicitly
state the role of the pattern. Like rules, pattern names typically name
the solution, not the problem: a matching pattern might just be called
SHORT-TERM GOALS.

Outlook

Patterns are a formal means of documentation, and such means open the
door to software tools for maintaining and editing game design
documents. Take screenplays: word processors can be configured to handle
the canonical format for scriptwriting, and some applications have been
designed specifically to support that movie industry format. Many game
companies and game designers have devised their own internal standards
for game design documents. But defining a standard format for game
design documents is of limited use unless there are editing and search
facilities that support and enforce the format.  A pattern language is a
natural match for descriptive markup, e.g. XML, with a huge potential
for tool support based on off-the-shelf software. The value of any
"living" document is directly related to the ease of its
maintenance. Structured editing aids structured thinking: if a design
document does not have clear organization, its use of keywords and names
is inconsistent, and relevant information can not be located quickly
when needed, the document is practically useless.

Consequently, game developers have to make a sustained, conscious effort
to define and describe the recurring elements of their daily work -
whether as patterns, rules or some other method -- so we can begin to
create software tools made or adapted specifically for game design
purposes. The case for Alexandrian game design patterns [22,29] seems
strong: they have proven themselves in other and diverse professions;
they are intuitive, well documented, and a familiar concept to software
engineers, yet are flexible enough to permit anecdotak or informal
descriptions of artistic choices.

Bibliography

[1] Christopher Alexander. Notes on the Synthesis of Form. (Harvard
University Press 1964, 1966, 1979.) ISBN 0-674-62750-4 (cloth) ISBN
0-674-62751-2 (paper)

[2] Christopher Alexander, Murray Silverstein, Shlomo Angel, Sara
Ishikawa, and Denny Abrams. The Oregon Experiment. (Oxford University
Press, 1975.) ISBN 0-19-501824-9

[3] Christopher Alexander, Sara Ishikawa, Murray Silverstein, Max
Jacobson, Ingrid Fiksdahl-King, and Shlomo Angel. A Pattern Language:
Towns, Buildings, Construction. (Oxford University Press, 1977.) ISBN
0-19-501919-9

[4] Christopher Alexander. The Timeless Way of Building. (Oxford
University Press, 1979.) ISBN 0-19-502402-8

[5] Brad Appleton. Patterns and Software: Essential Concepts and
Terminology. Last update: Feb. 2000.

[6] Hal Barwood. "Four of the Four Hundred 2001". (GDC lecture, 2001.)

[7] Hal Barwood and Noah Falstein. "More of the 400: Discovering Design
Rules 2002" (GDC 2002 lecture)

[8] Cliff Bleszinski. "The Art and Science of Level Design." (GDC 2000,
pp. 107--118.)

[9] Jon Blossom and Collette Michaud. "Postmortem: LucasLearning's Star
Wars DroidWorks" (Gamasutra 1999.) Originally Game Developer magazine,
Vol 3, Issue 28, pp. 52-58, July 1999.

[10] Steven Chen and Duncan Brown. "The Architecture of Level Design." 
(GDC 2001 Proceedings, pp. 167--175.)

[11] Doug Church. "Formal Abstract Design Tools." (Gamasutra,
1999. Originally Game Developer magazine, Vol 3, Issue 28, July 1999.)

[12] Doug Church. "Abdicating Authorship: Goals and Process of
Interactive Design." (GDC 2000, San Jose, Lecture 5403 (not in
proceedings).)

[13] Stephen Clarke-Willson. "Applying Game Design to Virtual
Environments" (Digital Illusion, ACM Press, Vol. 2, Issue 1, January 1,
1998.)

[14] (N/A).

[15] Chris Crawford. The Art of Computer Game Design, Chapter 6: "Design
Techniques and Ideals." 1984.

[16] Troy Dunniway. "Using the Hero's Journey in Games." (Gamasutra,
1999. Originally published in Game Developer magazine, August 1999.)

[17] Troy Dunniway. Professional Game Design. (New Riders. To be
published June 2002. ISBN 0-7357-1184-4. )

[18] Noah Falstein. "Better By Design: The 400 Project". (Game Developer
magazine, Vol. 9, Issue 3, March 2002, p. 26.)

[19] Erich Gamma, Richard Helm, Ralph Johnson, and John
Vlissides. Design Patterns: Elements of Reusable Object-Oriented
Software. (Addison Wesley Longman, 1994.) ISBN 0-201-63361-2.

[20] Chris Hecker and Zachary Booth Simpson "Game Programming Patterns &
Idioms." Game Developer magazine, Sep. 2000.

[21] John Hopson "Behavioral Game Design." Gamasutra, April 2001.

[22] Bernd Kreimeier. Game Design Patterns. Wordware Publishing, Inc. To
be published March 2003.) ISBN 1-55622-967-4

[23] Brenda Laurel. Computers as Theatre. (Addison Wesley Longmasn,
Inc. 1991, 1993 ISBN 0-201-55060-1.)

[24] Marc LeBlanc. "Formal Design Tools: Emergent Complexity, Emergent
Narrative." GDC 2000, San Jose, Lecture 5304 (not in proceedings).

[25] Gerard Meszaros and Jim Doble "A Pattern Language for Pattern
Writing"

[26] Pierre-Alain Mueller. Instant UML. (Wrox Press, Ltd., 1997) ISBN
1-861000-87-1.

[27] Karen Pryor. Don't Shoot The Dog! (Bantam Doubleday, 1999) ISBN:
0-55338-039-7 (revised paperback edition)

[28] Andrew Rollings and Dave Morris. Game Architecture and Design. (The
Coriolis Group, 2000.) ISBN 1-57610-425-7

[29] Andrew Rollings and Ernest Adams. Patterns in Game Design. (The
Coriolis Group, to be published May 2002.) ISBN 1-57610-873-2

[30] Richard Rouse. Game Design: Theory & Practice. (Wordware, Inc.,
2000) ISBN 1-55622-735-3

[31] Aamod Sane "The Elements of Pattern Style." December, 1995.

[32] Viktor Shklosvsky. Theory of Prose Dalkey. (Archive Press 1990,
1991.) ISBN 0-916583-54-6 (cloth) ISBN 0-916583-54-6 (paper).

[33] Zachary Booth Simpson "Design Patterns for Computer Games." 1998
CGDC Austin, TX, November 1998, also San Jose, CA, May 1999.

[34] John Vlissides. "Pattern Hatching - Seven Habits of Successful
Pattern Writers." C++ Report. Nov/Dec 1996, and Pattern Hatching: Design
Patterns Applied (Addison Wesley, 1998).

[35] Christopher Vogler. The Writer's Journey: Mythic Structure for
Writers. (Michael Wiese Productions, 1998.) ISBN 0-941188-70-1
--<cut>--

--
J C Lawrence                
---------(*)                Satan, oscillate my metallic sonatas. 
claw at kanga.nu               He lived as a devil, eh?		  
http://www.kanga.nu/~claw/  Evil is a name of a foeman, as I live.
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