An increasing number of studies are concerned with the international comparison of the results that different education systems achieve. For example, TIMSS, PIRLS and PISA publish the results from different countries in mathematics, science and literacy. The European Commission has also published indicators and benchmarks relating to the quality of school education. This type of external evaluation is often perceived by teachers as judgemental and controlling. In contrast, internal school-based evaluation aims to be seen as a developmental process contributing to improved teacher and student learning, where ownership of the evaluation processes remains with the school stakeholders. This paper examines the possible tensions and conflicts that may arise between these two types of evaluation and asks the question 'How can we overcome the negative attitudes that may have resulted from external evaluation in order to encourage schools to undertake internal school-based evaluation?' The paper explores, using Scottish case studies, ways in which schools through their internal self-evaluation processes may use the data in different ways to meet some, if not all, of the external demands placed on them. This strategy, it is argued, ensures that evaluation is largely done for school purposes and as an aid to the learning process, rather than as an external assessment designed to hold schools accountable for the learning achieved to date.