All handicapped students as defined by federal and state statutes and regulations will be included in the assessment program unless the student's individual educational plan (IEP) as required by Public Law 94-142 indicates that such assessment would be inappropriate. The inclusion or exclusion of handicapped students shall be on a case by case basis as determined by the child's IEP. In preparing IEP's for handicapped students school districts shall specifically address the appropriateness of a child's participating in the assessment program as required by this chapter.