In the Netherlands and in the United States, the assessment process is changing for children who present learning and behavioural challenges in school. Evaluations for eligibility determinations and support planning are shifting along with disability models and tensions over the provision of inclusive schooling. Legislative edicts influence the assessment process differently in these two countries while both nations seem to be headed in a similar direction. This paper relates evolving disability models to the changing assessment process in each country and proposes that a solution-focused perspective offers an assessment concept which supports the goal of inclusive education. Specifically discussed are the implications of a solution-focused approach on the identification of disability, the assessment of special educational needs, individualized support planning, and the essential cooperation within evolving schools as well as the environment beyond.