Several writers have suggested that genuine involvement by the school principal is a crucial context variable influencing the level of innovation in a school[1,2,3,4,5]. Griffin[6], for example, suggests that the principal is responsible for establishing and maintaining the perception of the mission of the school, while McLaren proposes that "the general tone of the school and its staff is determined by the headmaster"[7] and Higham argues that "there can be no possibility of taking initiatives with which the head may disagree. The authority to initiate . . . must come from the head[2, p.118]. The belief, then, is that the principal acts as "an organiser of professional development, a facilitator to the faculty, and a negotiator of resources for the school . . . His personal style, level of activity, competence and relationships with faculty and community, all interact with his ideas . . . to make him a powerful determinant of what will happen[4, pp.28-9].If these views are correct, it may be inferred that the level of educational progressivism shown by the principal will convey to the staff the importance and priority that they are expected to place on the processes of staff development and school improvement. Australian studies by Thomas[8] and Mulford[9] found positive links between the supportiveness of principals and the innovativeness of primary schools and secondary schools respectively. Smyth supports this finding, arguing that the level of in-service sponsorship and support in a school will be substantially dependent upon the willingness of the principal to provide "(i) Stimulation of staff, that charismatic quality by means of which the vision of what is possible is expanded; (ii) Support, moral and material, of staff involvement in the planning, conduct and follow-through of school-based programmes; and (iii) Statesmanship in negotiating policy and changes in structure and practice with individuals, groups and the staff as a whole" [10].The suggestion seems to be that, unless teachers are confident of the genuine support of the principal, they will resist pressures to evaluate and, where necessary, modify their traditional modes of operation [ll,12,13]. Indeed, the SITE project found that even when the principal tried to remain neutral in order to observe and evaluate the progress of an innovation "staff predominantly construed the head's position not as indicating neutrality but as a positive indicator of lack of