The Agile model is widely considered to be a realistic approach for development. It is an interactive approach in which the various phases operate in parallel. Most notably, Agile provides a working product quickly by breaking the product into cycles.
Advantages of the Agile Methodology. The Agile model emphasizes interaction as customers, developers, and testers coordinate throughout the project. Due to the model’s interactive nature, changes are easily brought into the process. It’s a transparent approach for tracing progress. Additionally, each iteration provides helpful feedback on the product.
Disadvantages of the Agile Methodology. Clear and thorough foundational requirements about product direction are critical. If the foundational requirements change often, planning becomes complicated and the project can go awry. Team members must be highly cross-skilled since core teams are often small. Team members must also be up-skilled on the chosen Agile framework.
Other SDLC models include the V-shaped model, the iterative model, and the spiral model. These are variations of the Waterfall and Agile models with similar advantages and disadvantages.