This document describes in some detail the origins and implications of the Michigan Teachers' Tenure Act of 1964. After describing the nature and general effects of tenure, the document discusses specific aspects of tenure law, citing relevant court cases and decisions by Michigan's Tenure Commission. The first topic covered is probationary service, including requirements and definitions of the probationary period, procedures for nonreemployment of probationary teachers, and dismissal of probationary teachers. The discharge or demotion of tenured teachers is discussed next, including procedures, adequate justification for the actions taken, and the characteristics of hearings and formal charges. The full range of the right of appeal of tenured teachers is reviewed in the fourth chapter. The fifth chapter deals with the relationship between tenure and such related personnel matters as leaves of absence, layoff and recall, transfer and reassignment, discontinuance of service, retirement, and extra pay for extra duty. The last two chapters cover tenure for administrators and remedies for tenured personnel wrongfully suspended, demoted, or discharged. Appendixes include the text of the Teachers' Tenure Act, the procedural rules of the State Tenure Commission, and listings of relevant decisions of state courts and the state's Attorney General. (PGD)