Development, testing, acceptance and production (DTAP)[1][2] 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.