Universal evolutions in the field of education and didactic have forced Turkish education system to a reform. This reform, inaugurated in 2005, promotes a new approach to education and accordingly to assessment. It is obvious that success of educational system depends greatly on the practices of teachers in classes. We examine here the compliance of these practises with the official "Science and Technology" course curriculum in Turkish context. In this paper we first analyze the curriculum to determine the characteristics and institutional expectations regarding the assessment activity in classroom. We then analyse the interviews performed with teachers in order to test the correlation between official expectations about assessment methods and teaching practices. The results of this research show that things are not as expected in classroom and teachers face great difficulties to satisfy institutional needs. Indeed, teachers cannot apply alternative assessment methods as required by the curriculum because of the difficulties arising due to teachers, students or the infrastructure of schools.