The Western Washington State College Teacher Corps Project (WWSC/TC) has developed a teacher designed inservice model as part of its Ninth Cycle program. The model is based on a collaborative approach to inservice education, in which the teacher is able to draw on the resources of an institution of higher learning, a local education association, and a teacher association for design, implementation, and evaluation of his/her inservice model. The purpose of this document is to describe the preparation and present state-of-the-art of the cost benefit model for the inservice project. The term "cost" signifies the specific dollar value that might be assigned to an activity or material. "Benefit" and "liability" indicate value judgments placed on institution, training, environment, or programs of interest to teachers and/or administrators, for which a dollar amount cannot be assigned. The document (1) reviews the cost, benefit, and liability model for the individual teacher contracts and discusses budget and funding sources; (2) reviews cost, benefits, and liabilities for the inservice consortium, with a discussion of its fundings and functions; (3) reports on some initial cost studies in which the models have been applied; and (4) comments on the application of cost studies to the WWSC/TC model. Three appendices are included: (1) a sample teacher contract; (2) a catalogue description for a problem-solving practicum in action research to identify specific needs of a target school; and (3) a general fund expenditure classification for the model. (MB)