I wish this were actually the case in the Starter Set adventure. Perception alone is used to notice traps and to actively search for them, which is a shame. I absolutely prefer the idea that passive perception is there to give you a clue that something is amiss, and not necessarily find a trap. Investigation skill should be used for actively searching.
This would go a long way toward putting perception back in line with the other skills.
Yeah, after re-reading the Basic D&D sidebar on page 61 about "Finding Hidden Objects" I am not sure ethe writers had a clear distinction between Perception and Investigation.
Perception is specifically called out as being used to sense hiding monsters, notice secret doors, and detect traps. Moreover, when you "plot around a room searching for clues" you don't find anything unless you specify where you are looking, in which case you either automatically succeed (if it would be obvious) or roll Perception (if it would be hidden and requires thorough searching).
*blink*
Uh, that sounds like a textbook example of Investigation to me. Investigation is specifically called out as a way to deduce the location of a hidden object...maybe what was meant by "hidden object" in this context was "buried treasure" or some other McGuffin that is not immediately present or the PCs are searching for via a string of clues rather than trial-and-error Perception?
Looking at the other uses for Investigation...discerning what kind of weapon caused a wound, finding the weak point in a tunnel, or searching for a hidden fragment of lore in an ancient scroll...this interpretation fits in with the overall theme. Investigation is about interpreting the obvious in un-obvious ways.
From this perspective, Investigation could powerfully "augment" what characters do with other skills...
Perception notices the hidden forms lurking behind the manor doors, but Investigation deduces that the princess didn't exit thru the doors because she was never seen in public without her signature sapphire comb which is still on the table.
Medicine diagnoses the disease, but Investigation deduces that the one thing the victims have in common is drinking from the same water source.
Insight realizes that the princess' interest in caring for the diseased goes beyond altruism to the personal, but Investigation deduces that the unusually feminine handkerchief they found in the tanner's home in the quarantine zone belongs to the princess because the weaver signature matches that on the princess' bed sheets.
Etc.