system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How exactly are Rorscach tests assessed?
gpt
The clinician has a very expansive list of historical answers from people and how those answers correlate with various mental illnesses and maladies.  They administer the test, document what the patient says for each image (which are standardized) and compare those answers to the historicals.  From there, they make an assessment of how well the patient aligns with patterns of answers and use that to create a diagnosis.

For this reason, anyone trained in Rorschach can't be administered one - you know how they are graded.

That all said, they are rarely used anymore due to the huge variability in answers and better tests (like the MMPI) existing.