Development, testing, acceptance and production
Development, Testing, Acceptance and Production (DTAP) is a phased approach to software testing and deployment. The four letters in DTAP denote the following common steps: The set of environments used for a DTAP cycle is often called a DTAP street. The set of environments can be smaller or larger, depending on the demands of the project. Examples of other steps are: Though the methodology is called DTAP, some projects might use DTAPB, DTP, DTEP or any other variant addressing the project needs.