Chapter 5 Andrew Bates Jay Babb Steve Haroz

Introduction “Log Cabin” Analogy Design before Implementation

Specification Methods Natural-language vs. formal/semiformal  Grammars Menu-tree Structures Transition Diagrams User Action Notation (UAN)

Grammars Backus-Naur Form (BNF) ::= ::=, ::= ::= | ::= A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z ::= ( ) - ::= ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

Transition Diagrams Computer-Assisted Software Engineering (CASE) Complexity issues

User-Action Notation (UAN) User ActionsInterface FeedbackInterface State ~[file] Mvfile!, forall(file!): file-!selected = file ~[x,y]*outline(file) > ~ ~[trash]outline(file) > ~, trash! M^erase(file), trash!!selected = null

UI Building Tools UI Independence –Separate interface design from internals –Enable multiple UI strategies –Enable multiple platform support –Establish role of UI architect –Enforce standards

UI Building Tools (cont.) Methodology and Notation –Develop design procedures –Find ways to talk about design –Create Project Management Rapid Prototyping –Try out ideas early –Test, revise, test, revise… (iterative design) –Engage end users, managers, and customers

UI Building Tools (cont.) Software Support –Increase Productivity –Offer constraint and consistency checks –Facilitate team approaches –Ease maintenance

Design Tools