How do you choose between waterfall and iterative IT consulting methods?

1 What are waterfall and iterative methods?

Waterfall and iterative are two common IT consulting methods that describe how a project is planned, executed, and delivered. Waterfall is a linear and sequential method that follows a predefined set of stages, such as analysis, design, implementation, testing, and deployment. Iterative is a cyclical and incremental method that divides the project into smaller and more manageable units, called iterations, that are completed and reviewed in a short time frame.

2 When to use waterfall method?

Waterfall method is best suited for IT projects that have clear and stable requirements, well-defined scope and deliverables, and minimal changes or uncertainties. Waterfall method allows you to have a clear vision of the end product, a detailed plan of the project activities and resources, and a fixed budget and schedule. Waterfall method also ensures that each stage is thoroughly completed and tested before moving to the next one, which reduces the risk of errors and rework.

3 When to use iterative method?

Iterative method is best suited for IT projects that have dynamic and evolving requirements, complex and uncertain scope and deliverables, and frequent changes or feedback. Iterative method allows you to adapt to the changing needs and expectations of the stakeholders, deliver value and functionality in shorter cycles, and incorporate learning and improvement along the way. Iterative method also enables you to test and validate your assumptions and solutions early and often, which increases the quality and user satisfaction.

4 How to compare waterfall and iterative methods?

When deciding on an IT project, Waterfall and iterative methods both have their own strengths and weaknesses. Flexibility-wise, the Waterfall method is rigid and inflexible, while the iterative method is agile and adaptable. Communication-wise, Waterfall relies on extensive documentation and formal reviews, while iterative encourages frequent communication and interaction. Risk-wise, Waterfall is riskier and costlier, while iterative is less risky and more cost-effective. Lastly, in terms of speed, Waterfall is slow and delayed, while iterative is fast and timely.