SAHISA hosted a discussion forum for heads and principals on 3 September 2021. The topic of discussion was Instructional Leadership. Easy to Talk About. Hard to Do? and was le by Jonathan Manley. All the research shows that top tier heads make a difference to pupil performance. In . . . The remainder of this page is only available to ISASA members. If you are an ISASA member, please login to view the page content.