To be honest, I can’t say I’ve experienced website or app with good information architecture. Even though I see some well organized website with good IA, I always curious about overlap category as a user.
For example, this is one of my least favorite website I’ve ever experienced, it’s called ‘Work day”. I believe we can still called it “IA”. When you go to work day portal website, you will see this page. I was struggled a lot (honestly still now…) where is saved schedule. Ridiculously, when you click ‘View My Academic Plan” you can see ‘saved schedule’. How people can expect this function under :Register for Course”. When I see this page at the very first time I thought ‘saved schedule’ will be under “View My Academic Plan”, because it is also part of my plan that I’ve created. (There is too many problem in workday I believe, but those are not quite relevant with IA, so I will talk about it later) Even search engine doesn’t work for saved schedule.
I believe in this case, there will be more effective solution, but for general IA problem, I have one suggestion (solution) which is make universal search engine. If there is universal search engine, people can easily find out what they wants to see!