This collection covers various methodologies within the Software Development Life Cycle (SDLC), particularly highlighting the Waterfall model. It discusses the structured phases of software development—such as requirements analysis, design, implementation, testing, deployment, and maintenance—emphasizing the importance of thorough documentation, planning, and the linear sequence in which tasks must be completed. The material contrasts traditional methodologies with more flexible approaches like Agile, each suitable for different project requirements and contexts.