This is a retrospective account of the Del Mod System, a statewide project to improve science and mathematics education in the elementary and secondary schools of Delaware. The project functioned from 1970-76 under the auspices of a committee including the presidents of institutions of higher education, the state superintendent of public instruction, and a representative of the governor with grants from Du Pont and the National Science Foundation. The system was designed to identify and pursue statewide goals in a coordinated set of teacher training activities. A central feature of the system was a network of curriculum resource centers and educational field agents. This report is written as a case study to illustrate a number of themes--the weakness in current evaluation procedures when they are used as a basis for decision-making in complex educational programs; the potential, given special funding, of a statewide network of curriculum resource centers and educational field agents; the advantages and limitations of federal subsidies for statewide collaboration in school improvement; and the rapidly changing context of elementary and secondary schooling during the period 1970-76. (Author/IRT)