Comparison Scenarios - Part 1

Waterfall is a linear SDLC model where each phase is completed before moving to the next, making it suitable for projects with stable requirements. Agile is an iterative and incremental approach that delivers software in small releases, allowing frequent customer feedback and adapting easily to changing requirements.

Agile is a software development philosophy based on iterative development, customer collaboration, and continuous improvement. Scrum is a framework that implements Agile principles using fixed-length sprints, defined roles (Product Owner, Scrum Master, Development Team), and ceremonies such as Sprint Planning, Daily Scrum, Sprint Review, and Retrospective.

Scrum organizes work into fixed-duration sprints with predefined roles and regular meetings. Kanban uses a continuous workflow without fixed iterations, visualizes tasks on a Kanban board, limits work in progress (WIP), and focuses on improving flow and delivery speed.

Software Development Life Cycle (SDLC) is the complete process of developing software from planning to maintenance. Software Testing Life Cycle (STLC) is a subset of SDLC that focuses only on testing activities such as test planning, test case design, execution, defect reporting, and test closure.

SDLC defines the stages involved in developing software, including planning, design, development, testing, deployment, and maintenance. DevOps is a culture and set of practices that integrates development and operations using automation, continuous integration (CI), continuous delivery (CD), and continuous monitoring to deliver software faster and more reliably.

SDLC is a structured process that defines the phases involved in software development. Software Engineering is the broader discipline that applies engineering principles, methodologies, and best practices to design, develop, test, deploy, and maintain software systems. SDLC is one part of Software Engineering.

Waterfall follows a sequential approach with minimal flexibility and is suitable when requirements are fixed. The Spiral Model combines iterative development with risk analysis, allowing repeated cycles of planning, prototyping, development, and evaluation. Spiral is preferred for large, complex, and high-risk projects.

Waterfall performs testing only after the development phase is completed. The V-Model extends Waterfall by associating each development phase with a corresponding testing phase, enabling early test planning and better defect detection. V-Model is ideal when requirements are stable and quality assurance is critical.

The Prototype Model builds an early working model of the software to clarify and refine requirements before full development begins. The Spiral Model focuses on iterative development with continuous risk assessment and customer feedback throughout each cycle. Prototype emphasizes requirement gathering, while Spiral emphasizes risk management.

The Incremental Model develops and delivers the software in multiple functional increments, with each increment adding new features. The Iterative Model repeatedly improves the same product through multiple development cycles, refining existing functionality until the final solution is achieved.

Rapid Application Development (RAD) focuses on fast software development using reusable components, rapid prototyping, and user feedback. Agile also supports iterative development but emphasizes continuous collaboration, adaptability, frequent releases, and long-term product evolution. RAD mainly targets rapid delivery, while Agile focuses on continuous improvement.

The Big Bang Model involves little planning, minimal documentation, and development begins without a clearly defined process, making it suitable only for very small or experimental projects. Waterfall follows a structured sequence of well-defined phases with detailed planning and documentation, making it suitable for projects with stable requirements.

A Software Requirements Specification (SRS) is a comprehensive document describing both functional and non-functional requirements, system constraints, and overall project requirements. A Functional Requirements Specification (FRS) focuses only on the functional behavior of the software, explaining what features and operations the system must perform.

A Business Requirements Document (BRD) captures high-level business objectives, stakeholder expectations, and business needs. A Software Requirements Specification (SRS) converts those business requirements into detailed technical and functional requirements that developers and testers use during implementation.

Functional Requirements define what the software should do, such as user login, payment processing, or report generation. Non-Functional Requirements define how well the system should perform, including performance, security, reliability, scalability, usability, and availability. Functional requirements describe system features, while non-functional requirements define quality attributes.