We have developed an automated clinical laboratory and this new system was named the Clinical Laboratory Supervised System (CLASSY). We used NEC system 3500 Model 10 as the host computer of our laboratory. This host computer has 32Mb of main memory and a 12 Gb magnetic disk unit. CLASSY covers the automated analysis not only for clinical chemistry, but also for a haematology and urinalysis. CLASSY is organized with various subsystems and the many automatic analyzers that are connected with the interface units. CLASSY has a lot of functions, where are: (1) receives information about orders, (2) transmits this information to each subsystem or analyzer, (3) receives the results of the test from the analyzer, (4) transmits the results of the test to the hospital host computer, (S) unifies management of results making it unnecessary for each assay field to have its own computer, and (6) enables data retrieval from any assay field. Through the development of CLASSY we can rapidly manage many test tubes and can perform many laboratory tests without paper.