I realized that I don't know the difference between a school psychologist and a child clinical psychologist. At face value, I'd assume that a Clinical Child Psychology program would provide more training in therapy or psychopathology, but looking through the degree requirements and course offerings for both programs, I realized that there's very little difference. I had applied to both last fall, and have already chosen a school, but I've never really thought about this, or the implications of this difference for each career path. (Too late!
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School psychology has 3 different degree levels: Masters, Specialist, and Doctorate. I would strongly suggest to anyone looking at school psychology to go for a degree at the doctoral level, as it will open the most doors for you (and hopefully will also provide funding).
Most clinical/counseling psychology programs are generalist programs with options to receive mentorship and take classes in specific areas (child, neuro, forensics, etc). Some programs will offer their degree in a specific area, though those are in the minority.
There are also some clinical/school programs psychology, though this is much less common. I can think of 6-8 combined programs, though they all seem to be in the northeast. If I were looking at doing school psychology and wanted the most flexibility, I would look at these programs.
There is quite a bit of variance between universities and within programs, so it is hard to include/exclude just based on the degree title. It is probably easiest to work backwards, figure out what you want to do, and then find a program that best meets those goals.
Acred. status is an important consideration for any program. Ideally you'd want to attend a program that is APA-acred. (for clinical/counseling psychology) or a NASP-acred. for school psychology. You also need to take into account if students from the particular program can land APA-acred. internship sites. This is less important if you want to be a traditional school psychologist and not practice outside of the school system, though it is more important if you want to have the most opportunities as a psychologist, since many clinical/counseling psychologist jobs req. the applicant to complete an APA-acred. internship.
I guess one reason is that in most(?) states, one can attain licensure as a school psychologist with a Master's, whereas licensure as a psychologist psychologist requires a PhD. But does that mean that once a school psychology PhD becomes licensed, there is no difference in the services that a school psychologist vs. child psychologist can provide?
Maybe. The final say in licensure and practice is the licensing board of each state. Some states are more strict with their scope of practice requirements, though generally they leave it open to interpretation. Scope of practice is the main consideration (can you practice in a particular area competently, and have your work be both ethical and legal?)
For instance, if you are a licensed psychologist and you work with adults with a range of Axis-I disorders, you probably shouldn't handle pediatric assessment cases for a hospital, unless you have significant training in that area prior to taking the cases. It is up to the clinician to be aware of their training and their scope limitations. There are at least 1-2 posts per week on the various psychology list-servs of clinicians inquiring about referrals to do this kind of work without prior training. It can be dicey at best, and the general concensus is to not go into a new area without mentorship.
As for a clinical psychologist practicing in a school setting....it definitely happens, with a range of outcomes. Some school systems will require the school psychologist to have trained in the area (typically completing an internship in a school setting), while other school systems are more lienent with their requirements. Some school psychologists are used only for assessment, while others can do more work with IEP planning, classroom interventions, etc. I personally wouldn't feel comfortable working as a school psychologist without some mentorship to start, though I do have a couple of years of working with children and one year working in a school system doing assessment and intervention work. There are definitely differences in training, and I wouldn't recommend trying to work in the school system without additional mentorship. I know when I first worked in a school setting I had no training in IEP development or the educational standards used within the school system, so I had to seek additional mentorship and training to get up to speed. I also recommend mentorship and additional training for any school psychologist who goes outside of their core training areas.
There has been somewhat of a shift in regard to school psychologists practicing outside of the school system, at least at the Ph.D. level. It is more common to see them in a hospital, in private practice, etc. then it was 10-20 years ago, though the majority of school psychologists still practice within the school system.