The Westernport Bay Environmental Study is a major multi-disciplinary program that began in 1973. The study was designed to obtain broad scientific knowledge of the bay and its catchment preceding major urban and industrial development. Initially, it comprised over 50 projects, including marine, land, and social and economic studies and has continued into its second phase. Funding was provided by state government and industry, and direction of the study was by representative committees, a Study Director and scientific and technical core groups. Co-operative investigations embraced government, university, industry and other scientific groups. The Westernport Bay Environmental Study has continued to evolve and has become the Westernport Regional Environmental Study, one of the three major parts of the Environmental Studies Program of the Ministry for Conservation. © 1979.