What is Waterfall and why is it considered bad compared to Scrum?

Waterfall (cascade model) is a traditional approach to software development, where the process is divided into sequential phases: requirements analysis, design, implementation, testing, deployment. Each phase is completed fully before moving on to the next.

Disadvantages of Waterfall compared to Scrum:

• Low flexibility: it is difficult to accommodate changes in requirements after development has started.
• Late feedback: testing and verification occur at the end, increasing the risk of discovering errors late in the process.
• Lack of iteration: there is no opportunity to regularly release working versions and receive feedback.
• Less customer involvement in the process.

Scrum is an agile methodology based on iterations (sprints), continuous communication, and adaptation. It allows for faster response to changes, improved quality, and increased transparency of the process.