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APSE standing for Ada Programming Support Environment was a specification for a programming environment to support software development in the Ada programming language. This represented the second stage of the U.S. military Ada project; once the language was implemented, it was felt necessary to specify and implement a standard set of tools, hence the APSE. CAIS-A, Common APSE Interface Set A, was defined in MIL STD-1838A.

CAIS defines a set of Ada APIs to enable portability of development tools across operating systems.[1] As of 1988, CAIS implementations were under development for Unix, VMS and IBM MVS.[1]


  1. ^ a b Oberndorf, P.A. (June 1988). "The Common Ada Programming Support Environment (APSE) Interface Set (CAIS)". IEEE Transactions on Software Engineering. 14 (6): 742–748. doi:10.1109/32.6154. ISSN 0098-5589.

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