LAUSR

Abstract This study investigates the extent to which the Dynamic Approach (DA) to Teacher Professional Development (TPD) can help teachers develop their assessment skills and through that contribute to the improvement of student learning outcomes. To achieve this aim, a multi-treatment group randomisation study was conducted to compare the impact of the DA with the impact of the Competency-Based Approach (CBA) on developing assessment skills and promoting student learning outcomes. Assessment skills of 178 teachers and achievement of their students (n = 2358) were measured before and after the intervention. The DA had greater impact on teacher assessment skills and student learning outcomes than the CBA. Differential effects were also identified since differences in the impact of each approach were only identified for teachers who were situated at higher stages of assessment skills. Implications of findings for research, policy and practice are drawn.