This data supplement, which covers 1976-77, updates the statistics and information contained in EA 009 930. Both parts of "Planning for Better Education in Wisconsin" were compiled by the Wisconsin Department of Public Instruction to provide information needed by local school boards, administrators, advisory committees, and agency school committees. The purpose of these volumes is to provide information for school district planning and educational improvement. Sections of this data supplement cover school district organization, enrollment trends, school census and population information, school boards, and other areas. (Author/DS)