Name. Navigation Path. Type. Navigation Link. Needed for. Navigation Framework. Context. Hierarchical Information Spaces. Forces. Need to see current label ...
Prescriptive Design Patterns Proactive Guidance for Real-World Systems
Kevin Mullet REACTOR Experience Design
Patterns are Good • Capture Real Design Insights • Represent Knowledge in Structured Form • Impose Discipline on Design Team • Encourage Designers to Think Globally Problem is the Effort of Creating & Using Them
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
Patterns (Today) are Not So Good • Often perceived as overly constraining • Existing collections are hopelessly incomplete • Generally fail to proactively “lead” to a solution • Require lots of knowledge to apply correctly Control of Abstraction is the Key to Success
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
Background and Experience • Software Design Education • Industrial Design, Experimental Psychology, Computer Science • BS & MA from The Ohio State University
What Practitioners Want • Practitioners tend to be highly pragmatic • They demand very concrete examples • They resist what seems like needless abstraction • They want patterns to lead them to good design Existing PL’s Don’t Tell You How to Get There
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
What Practitioners Need • Tools that capture complexity of real world • Single integrated repository for design info • “Patterns” for things like GUI Standards • “Patterns” for conventional application designs Need a Broader Sense of “Pattern-ness”
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
Prescriptive Pattern Languages • Must guide practitioners to effective designs • Must address more than just general solutions • Must be extensible and specific • Must provide a common integration framework Must Clarify Relationships Between Patterns
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
Types of Pattern Relationships • Aggregation (“has-a”) Pattern B is part of Pattern A • Derivation (“is-a”) Pattern B is a specialized form of Pattern A • Reference (“uses”) Pattern A requires the presence of Pattern B
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
Aggregation • Alexandrian pattern languages are structured around aggregation hierarchies (networks) • Very natural and concrete compositions • Necessarily quite general Forms the Basis for a Prescriptive Framework
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
Derivation • Derivation captures the evolution from general to increasingly specialized solutions • Also natural, but orthogonal to composition • Confusion results when the two are mixed Uses Inheritance to Manage Complexity
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
Reference • Reference relationships link patterns that are intended to be used together • Can be used to simplify pattern hierarchies • Can be used to filter pattern languages Links Patterns Together to Create Solutions
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
Beyond “Related Patterns” Name Type Needed for Context Forces Summary Components Connections Rationale Examples Alternate Forms Special Cases CASCON 2002 Design Patterns
Derivation (Parent) Aggregation (Parents)
Aggregation (Children) Reference (Links)
Derivation (Peers) Derivation (Children) Prescriptive Patterns: Proactive Guidance for Real-World Systems
Example Name Type Needed for Context Forces Summary Components Connections Examples Alternate Forms Special Cases CASCON 2002 Design Patterns
Navigation Path Navigation Link Navigation Framework Hierarchical Information Spaces Need to see current label and full path Make each path component a link, and separate them w/ a recognizable char Path Elements, Element Separator Type Style, Link Cues, Category Names Home > All Categories > Computer and Office Products
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Where We Stand • Several isolated pattern “languages” • All have some good qualities • Little or no connection between them • Need to leverage the Net to share work on converging and extending this work
CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
What You Can Do • Use prescriptive patterns as a formal structure to make your design work more generalizable • Think systematically beyond the immediate need • Be application-agnostic when defining behavior • Write two patterns if necessary (derive one)
• Help advance the art: Share your own patterns and provide feedback on the work of others CASCON 2002 Design Patterns
Prescriptive Patterns: Proactive Guidance for Real-World Systems
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