A clean room project is a technique used in software engineering to develop software that is correct by construction. It was first proposed by Harlan D. Mills in the late 1970s as a way to improve the reliability and quality of software. The idea behind the clean room project is to isolate the developers from the requirements and design of the software and let them focus solely on the code.

Clean room projects are particularly important for safety-critical software, such as software used in medical, aerospace, or military applications. In these applications, the consequences of a software defect can be catastrophic and can result in loss of life or property damage. Clean room projects can help to ensure that the software is developed correctly and is safe to use.