Methodological issues in school-based evaluation

Methodology in school-based evaluation is importantly affected by economic and ethical constraints often absent or less pressing than in larger-scale evaluations. These and other factors also operate in the specialized school-based evaluations such as that of school psychological services. Defensible evaluation designs must take into account the impossibility of random assignment and reduced options for the use of control groups. In addition there are numerous pressures on the construction and deployment of measuring devices and a need for ingenuity in performing statistical analyses. This article explicates these issues and outlines alternative approaches to methodology which can result in usable data for school decision making.