I pm'd you.
NASP is the National Association of School Psychologists. APA is American Psychological Association. School psychs who are members of either association are equally qualified to conduct assessments. APA also includes all other kinds of psychologists, qualified at the doctoral level (with the exception of school psychologists, who may be doctoral or specialist (post-master's) level practitioners. APA members who are qualified to conduct assessments of this type will usually be clinical, counseling, neuro, or school psychologists. Occasionally educational psychologists, but they're more research-oriented.
NASP as a professional advocacy organization is more concerned with children's, educational, and school issues, and has a membership that tends to skew toward master's/specialist-level practitioners. And females. APA represents a much wider range of psych specializations, requires a doctorate (unless you are in Div 16, school psych, but even then the majority of members are doctoral-level), has a higher concentration of university/faculty interests, and skews male (among school psychs). Many school psychs are members of both, especially doctoral-level practitioners.
