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environment. The effect sizes on               Coordinating school curriculum,
student outcomes of these dimensions           supervising instruction, monitoring
are identified as follows: ??(i) small         student progress, developing human
effects ??ensuring an orderly and              resources and creating a supportive
supportive environment, and                    working environment. Drawing on these
establishing goals and expectations,           findings this empirical study sought to
and strategic resourcing; (ii)                 scrutinize instructional practices of
moderately large effects ??planning,           Singapore principals, using four broad
coordinating and evaluating teaching           dimensions of instructional leadership,
and the curriculum; and (iii) large            namely: (1) Aligning teaching practices
effects ??promoting and participating in       to school vision; (2) Leading teaching
teacher learning and development.              and learning; (3) Developing conducive
                                               environments for teaching and learning;
In summary, there are similarities with        and (4) Promoting professional
regards to identifying the roles and           development. Although these four
practices of principals despite the            dimensions may not guarantee a
variety of published models on                 comprehensive account of instructional
instructional leadership. More                 leadership, they provide a useful picture
specifically, principals as instructional      of instructional leadership in practice in
leaders are expected to take an active         Singapore. These four dimensions are
role in setting school vision and              elaborated in the following section.
aligning teaching to school vision,
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