Types of Requirements
- Functional: Input-Output behavior
- Non-functional: Performance, privacy, reliability, etc.
- Constraint: Hardware resource, infra, etc.
Requirements Engineering
- Eliciting: Gathering (and helping users to define) requirements
- Analyzing: Formularizing the requirements gathered
- Documenting: Formal or semiformal documentation
Eliciting Strategies
- Interview
- Observation
- Workshop
- Prototyping
Eliciting Challenges
- Scope: Maybe out of scope
- Understanding: Users do not know their requirements
- Volatility: Requirements may change
Analyzing Techniques
- User Story
- Use Case
- Software Requirements Specification (SRS)
User Story
- Purpose & Value of functional requirements
- Who, What, Why (role, capability, benefit)
User Story Evaluation
- Independent: independent to others
- Negotiable
- Valuable: valuable to someone
- Estimable: cost must be estimable
- Small: cover single thing
- Testable: able to set acceptance criteria
User Acceptance Criteria
- Behavior-Driven Development (BDD) approach
- Given, When, Then (pre-condition, event, outcome)
Use Case
- Interaction between actor and system
- Actor’s point of view
- More detailed than user story
- To understand interaction sequence
Creating Use Case
- Identify Actor & Goal
- Main Success Scenario (steps)
- List Failure Extensions (Failure cases & how to handle)
- List Variants of main scenario (branching)
Wireframe
- Skeleton UIs and interaction
- content hierarchy
- space distribution
- possible app user actions
- app features
- transition between app pages
Specifications
- Explicit set of requirements to be satisfied
- Documenting requirements & system
Good Specifications
- Adequate: properly state the requirements
- Consistent: no conflict
- Complete: implementation must be available
- Unambiguous
- Minimal: include only related requirements
- Communicable: readable
Type of Specifications
- Informal: natural language
- Ambiguity & Contradiction Issue
- Semi-formal: graph / diagram
- Formal: mathematics based
Unified Modeling Language (UML)
- Standard of visualizing the design
- structural(static) & behavioral(dynamic)
Class Diagram
- Class
- Attributes
- Methods
- Relationships
- Association
- Aggregation
- Composition
- Inheritance
- Realization
- Dependency
Visibility
- +: public
- -: private
- #: protected
- ~: package (default)
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