This A-Level Computer Science lecture (Paper 2, Lecture 3) focuses on program development cycles, explaining the five-stage model (analysis, design, coding, testing, maintenance) and contrasting it with a six-stage model. The lecture also covers different development models (waterfall, iterative, rapid application development), their principles, benefits, and drawbacks.
Program Development Cycle (5 Stages): The core process involves analysis (understanding requirements), design (planning the program's structure), coding (writing the code), testing (checking for errors), and maintenance (ongoing upkeep). A six-stage model adds a "translating" stage.
Development Models: Three main models are discussed: Waterfall (linear, sequential stages), Iterative (repeating the cycle with feedback), and Rapid Application Development (parallel teams working on different modules).
Waterfall Model: This model is suitable for smaller projects with minimal client involvement. Its benefits include ease of management and understanding. Drawbacks include difficulty in changing requirements later in the process and a late delivery of a working program.
Iterative Model: This model is suitable for larger projects with high client involvement, allowing for feedback and adjustments throughout the development process. It involves multiple cycles of development and testing, improving the final product.
Rapid Application Development Model: This model utilizes multiple teams, each working on separate modules concurrently. It is ideal for large, complex projects where modularity is possible. Benefits include faster development times, more flexibility and frequent feedback. Drawbacks include needing a strong team of skilled developers and a need for a modular project design.
