Such information is critical for knowing whether the school system is delivering good performance and for providing feedback for improvement. A comprehensive system of evaluation is a requirement not only for the development of improvement strategies al all levels (teacher, school, administration) but also for measuring the success in achieving the goals of reform and for establishing a regime of accountability. Evaluations and assessments are requirements for an equitable regime of accountability, efficient management, effective decentralisation, and for devolution of autonomy to individual schools (OECD, 2011 a). Without such information, it is difficult to monitor the performance of schools and students and measure the achievement of learning objectives.