Why are psychological problems more difficult to classify than physical problems

Because the brain s so big and in so many ways unable to explain all the phenomena that occur. And unlike physical problems, psychologicalis often impossible to have in emotion and undoubtedly impossible to observe.

She was one of the world's first female heads of state.

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.