A school district has to decide whether to adopt a new 8th-grade math activity book, "Math World." Math World is a supplement to the regular curriculum. It presents problem-solving activities on concepts such as number sense and spatial reasoning. The problems are designed to permit multiple solutions. Students are required to record their solutions in writing, and teachers are provided with scoring rubrics. The teachers in the trial will be introduced to the book in a one-day workshop right before the school year. The students are required to use the book one period a week.

Before deciding to adopt the curriculum districtwide, the superintendent wants to carry out an experimental trial. She is concerned whether the adoption would be equally appropriate at all the schools and whether it should be accompanied by extra teacher training at some schools. This is because some of the schools have a history of higher student achievement than others. There are 40 schools in the district with an 8th grade.

You are hired as an external consultant to do the evaluation. What do you do?