The University of Twente published an article about the findings of the first two years of research on the impact of schoolinspections. The article is in Dutch only and can be found here.  

In respons to the article of Melanie Ehren, Herbert Altrichter, Gerry McNamara, and Joe O’Hara in Educational Assessment, Evaluation and Accountability the following article was published on the website International Ed News: http://internationalednews.com/2013/04/05/school-inspections-in-educational-evaluation-assessment-and-accountability/