ABSTRACT The Catholic Education Office of the Diocese of Parramatta administers a system of some 73 Catholic schools, approximately two thirds of which are primary schools. This paper focusses on a series of interrelated initiatives in the system which are aimed at enhancing school effectiveness ‐‐ namely systematic approaches to school development, positive and supportive procedures for principal appraisal, structures to support the professional development of principals and teachers, and emergent practice in the supervision of teachers. These five activites are seen as mutually interdependent in the diocese, with each helping to shape the agenda of the others, while at the same time providing resources which assist in addressing that agenda. The case study documents the development of the procedures for school development and appraisal by a group which was explicitly charged with the task of exploring the relationship between these two activities at both school and system levels. This led to the development of procedures and support mechanisms which are seen as distinct yet complementary. Principal appraisal contains a strong element of ongoing self appraisal based on performance, while school development procedures have a strong community dimension with the principal in a key role. An outline of these procedures is presented. Subsequent to the work on school development and appraisal, the Catholic Education Office reviewed its support for professional development. This led to greater clarity about the contribution of various elements of the annual system level professional development program to school development initiatives. A major review of principal professional development was undertaken. The significant elements of the review and the major recommendations to flow from it are discussed. All the initiatives discussed in this paper are in their early stages, with new procedures for school development and appraisal having been implemented on a working basis for the first time in 1993, and the frameworks for principal professional development being put in place for implementation during 1994.