Agile, Waterfall, and Lean - what’s the difference?

When it comes to software development, there are several different methodologies that can be used to guide the development process. The most popular are Agile, Waterfall, and Lean, and they each have their own approach and strengths.

‍Agile 

Agile methodologies, such as Scrum and Kanban, are based on the Agile manifesto, which emphasises collaboration, flexibility, and rapid iteration. Agile teams work in sprints and prioritise customer needs, with regular meetings to assess progress and adapt to new requirements as they arise. This allows for flexibility and the ability to change direction or add new features as necessary. 

Agile methodologies are well-suited for projects with a high degree of uncertainty or those that require frequent changes or iteration. Agile methodologies encourage collaboration and communication, fostering an environment of trust and transparency.

‍Waterfall ‍

Waterfall methodology is a linear, sequential approach to project management. It emphasises careful planning and control, and the development process is divided into distinct stages, each of which must be completed before moving on to the next. 

Because it is linear and sequential, it is less flexible and doesn’t allow for changes once a stage is completed. Waterfall methodology is best for projects with a well-defined scope, clear objectives, and a well-understood end result.

‍Lean ‍

Lean methodology is based on Lean manufacturing principles, which emphasise maximising value and minimising waste. It focuses on identifying and eliminating waste in the development process, and on delivering value to the customer as quickly as possible. 

Lean teams work in short cycles, with a strong focus on the customer, and rapid experimentation and feedback. Lean methodology is well-suited for projects that require high speed, efficiency, and minimal waste, where time to market is crucial.

‍What’s the best approach? ‍

These methodologies are not mutually exclusive and can be combined depending on your scenario. Sometimes it’s best to take a hybrid approach, using the strengths of these different methodologies at different stages of the project. 

Choosing the right methodology, and adapting it to the specific project, can help ensure a successful software development process.