"Fit for purpose" refers to how well a software product or system meets the requirements and expectations of its intended users and stakeholders. It means the software is suitable for its intended use and fulfills the purpose it was designed for, encompassing aspects like functionality, reliability, usability, performance, and maintainability.

Put simply, it evaluates whether the software satisfies the needs of users, stakeholders, and its core purpose. Software that fails to meet these needs is not considered fit for purpose.

When software is fit for purpose, it is free of defects and errors, performs consistently and correctly over time, and is user-friendly. Additionally, it adapts well to evolving requirements and technologies, remaining easy to modify and maintain.

In summary, being "fit for purpose" means the software:

• Is suitable for its intended use
• Meets the needs of users and stakeholders
• Performs reliably and as expected
• Maintains a suitable quality level
• Is free from defects