Information about school operations in 50 cities with a core population of over 300,000 is presented in an attempt to reveal something about changes taking place. Relating generally to trends in population, enrollment, and finance and to boards of education, 37 items of data are presented for each city. These include: Number of teachers and administrators, areas of school districts, instructional budgets, fiscal dependence or independence, percent of students in nonpublic schools, number of members on the board, method of choosing the board, length of term of office of board members, payment of board members, number of women on board, racial composition of board, and number of board meetings held. (HW)