\input zb-basic \input zb-ioport \iteman{io-port 05341893} \itemau{Nehmer, J.; Haban, D.; Mattern, F.; Wybranietz, D.; Rombach, H.D.} \itemti{Key concepts of the INCAS multicomputer project.} \itemso{IEEE Trans. Softw. Eng. 13, No. 08, 913-923 (1987).} \itemab Summary: This paper gives an overview of the INCAS (INCremental Architecture for distributed Systems) multicomputer project, which aims at the development of a comprehensive methodology for the design and implementation of locally distributed systems. A structuring concept for distributed operating systems has been developed and integrated into the system implementation language LADY. The concurrent high-level programming language CSSA, based on the actor model, has been designed for the implementation of distributed applications. A substantial effort in the INCAS project is directed towards the development of a distributed test methodology. An experimental system has been implemented on a network of ten MC68000 microcomputers. Preliminary experience with the methodology has been gained from a small number of prototype applications. \itemrv{~} \itemcc{} \itemut{multicomputer; distributed operating systems; distributed programming languages; distributed systems; distributed testing; message passing; multicast communication} \itemli{doi:10.1109/TSE.1987.233510} \end