Office shoes

So what sort of shoes do you wear in office? Slippers, clogs, flats.

For me, my usual office shoes are heels as I keep most of my heels in the office.  And I will wear flats to work as I need to walk my son to school. 

However, I have a quite a number of heels in office that sometimes they are forgotten.  Really need to find a way to keep track of all my stuff.  How do you keep track of your stuff??  What to do?  Please share.  

Cheers.