TT-1300 --- Writing Requirements with Structured Use Cases

Perhaps the single most significant factor that drives successful software projects

Perhaps the single most significant factor that drives successful software projects – those that meet customer and user needs – is the availability of a complete, consistent, clear, correct, testable set of functional and non-functional requirements. In particular, the functional requirements section is invariably the largest in the requirements specification, in terms of page count or word count, and invariably the most important, in terms of producing a robust information system. Clearly, organizations that can produce coherent, complete, consistent functional and non-functional requirements properly enjoy a decided competitive advantage, and are most likely to enjoy substantial returns on their software engineering investments.

• No specific prerequisites are assumed. A familiarity with information system concepts is recommended.

This course is suited for software practitioners, business analysts, systems analysts, project managers, and quality assurance professionals.

3 days

Writing Requirements with Structured Use Cases  (TT-1300) Content Details

Introduction to Requirements Documentation   Requirements Documentation Concepts Definitions Requirements process overview Requirements drive other work products Functional and non-functional requirements Requirements Specification Components Standards Audience Modes Functional and non-functional requirements Requirements specification process Understanding the Context Diagram Definition Structure Uses Accompanying description Examples Workshop: Preparing a Context Diagram and Accompanying Description from   Components of a Functional Requirements Specification   Use Case Concepts Definition Use cases and functional requirements Structured and narrative use case descriptions Use case properties Identifying use cases Benefits and costs of structured use case descriptions Workflow Diagram for a Business Process Workflow diagram structure Using the workflow diagram to identify predecessor and successor use cases Notation Examples Workshop: Creating a Workflow Diagram   Elements of a Use Case Description Structure Unique identifier Title Introductory narrative Main success scenario Extensions Workshop: Writing a Use Case Introduction   Main Success Scenarios   Elements of a Main Success Scenario Pre-conditions Steps Post-conditions Examples Writing Pre- and Post-Conditions Properties Format Examples Workshop: Writing Pre-Conditions and Post-Conditions   Writing the Steps of the Main Success Scenario Properties Format Notes Optional steps Multiple actors Examples Workshop: Writing the Steps of the Main Success Scenario   Extensions, Alternatives, and Fragments   Writing the Steps of Extensions Identifying extensions Trigger conditions Format Examples Workshop: Identifying Extensions     Workshop: Writing Extension Steps   Writing the steps of alternatives Identifying alternatives Alternatives vs. extensions Linking alternative use cases Examples Workshop: Distinguishing Alternatives from Extensions   Writing the steps of fragments Identifying and extracting fragments References to fragments Examples Workshop: Writing Fragments   Data Elements in Structured Use Case Descriptions Editing use case descriptions for data element consistency Examples Writing Data Structure Specifications Data element metadata Specifying data types Specifying valid domains Examples Workshop: Writing Data Specifications for Scenarios Produced in Earlier Workshops   Non-Functional Requirements   Writing performance requirements Need for performance requirements Writing performance specifications Response time Throughput Capacity Availability and reliability Workshop: Writing performance requirements   Writing interface requirements Interface types Protocols Writing system interface specifications Writing user interface specifications Writing design constraints Benefits Examples Workshop: writing design constraints   Writing characteristics Definitions Writing characteristic specifications Workshop: writing characteristic specifications   Evaluating Requirements Specifications   Evaluation Concepts Goals Participants Evaluation process overview What to Look for Completeness Internal consistency Consistency with other requirements Evaluation criteria for use cases Workshop: Evaluating Scenarios Produced in Earlier Workshops

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