This article reports the use of a Structural Equation Modelling (SEM) technique as a means of exploring our understanding of the leadership of Heads of Subject Departments within School Based Management (SBM) secondary schools in Hong Kong. Arguments made by Gronn (1999, 2000), Spillane et al. (2001) suggest that studies of leadership need to focus more on a distributed model rather than seeing leadership as residing solely in the titular head of the organisation. Other recent studies (Busher & Harris 1999; Harris 2001) have examined the role of middle managers. This article explores SEM as a means of offering important measurement and insight in this complex area. The structural models generated and presented support a new integrative model of the leadership activities and behaviours of the HODs within SBM secondary schools in Hong Kong. Some initial findings (Au 2003) are reported based on a return rate of 83% from a dataset of 2739 teachers, HODs, school principals and vice- principals taken from a sample of 110 government and non-government SBM secondary schools in Hong Kong. [Copyright of School Leadership & Management is the property of Routledge. Full article may be available at the publisher's website: http://dx.doi.org/10.1080/1363243032000150999]
