Written with people moving from Turkey in mind. The Portuguese rules still apply more broadly.
Regulated Professions (Ordens)
In Portugal, you cannot practice certain professions (Doctor, Architect, Engineer, Lawyer, Psychologist) just by having a degree. You must register with the respective "Ordem Profissional".
This often involves proving your qualifications, paying registration fees, and sometimes completing an internship or exam. Practicing without this registration is a crime (Usurpação de Funções).