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Introduction to Requirements Engineering

Framework for Requirements Engineering

  • Identifying the Requirements Engineering rationale
  • Planning and estimating requirements
  • Identifying the business rationale and inputs
  • Crafting the business case
  • Creating the Terms of Reference or Project Initiation Document (PID)

Building the Requirements

  • Categorizing requirements within the hierarchy
  • General business requirements, including legal and business policy
  • Technical policy requirements
  • Functional requirements
  • Non-functional requirements

Stakeholders in the Requirements Process

  • Project Stakeholders
  • Business Stakeholders
  • External stakeholders

Requirements Elicitation

Types of knowledge

  • Explicit knowledge and ignorance
  • Identifying tacit knowledge and ignorance

Eliciting requirements from stakeholders

  • Planning elicitation meetings
  • Choosing the right people to interview

Applying elicitation techniques

  • Selecting the best interview methodology
  • Constructing questions that deliver results

Requirements Engineering Modeling Techniques

Why model requirements?

  • Generating questions
  • Defining business rules
  • Cross-checking for consistency and completeness

Modeling the business context for the system

  • Developing a model to represent system processing requirements
  • Interpreting a data model

Documenting Your Requirements

Documentation styles and levels of definition

  • Writing standard requirements
  • Employing user stories and use cases

Creating a Requirements Catalog

  • Identifying necessary attributes
  • Writing a requirements description
  • Non-functional requirements

Requirements Analysis

Prioritizing and packaging requirements for delivery

  • Analyzing and prioritizing business needs
  • Allocating requirements

Organizing requirements

  • Optimizing business value
  • Evaluating dependencies between requirements

Ensuring well-formed requirements

  • Removing overlapping requirements
  • Identifying and negotiating conflicts between requirements
  • Removing ambiguity
  • Ensuring feasibility and testability
  • Prototyping requirements
  • Verifying requirements

Validating Requirements

Applying validation skills

  • Selecting the best validation methods
  • Validation checklists

Types of reviews

  • Reviews, walk-throughs and inspections
  • Stakeholders and their areas of concern

Requirements Management

Dealing with changing requirements

  • Types of changes
  • Frequency and magnitude of changes

The importance of traceability

  • Vertical traceability (to business objectives)
  • Horizontal traceability (from origin to deliver)
  • Traceability and ownership
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