I've recently started a Sim who is going down the doctor career track, and things were going well until I started having to Diagnose patients myself.
If you perform all the possible examinations, sometimes there is more than one possible diagnosis to choose from, and I couldn't figure out how I was supposed to narrow this down.
Getting the diagnosis, and therefore treatment, wrong give you a big penalty to your work performance, and the requirements for promotion include several successful diagnosis and treatments.
Does my Sim need more of a certain skill to improve their chances of succeeding at tests and analysis? Does their mood effect the chance of failure?
Is there more to this than just performing exams and tests until you have a "Compelling Diagnosis" with only one option?