I guess that's where family and friends of the PwP can ascertain whether the behaviour was there all through their life or due to PD.
I don't have PD but
(1) if I start to read a book and continue after more than one week I have to start from the beginning.
(2) all of my CD's and DVD's are ordered by artists name (alphabetical order) - thus I know where a CD or DVD _should_ be
(3) i do not like seeing bottles/containers near empty in fridge or pantry so I pour contents into a full bottle of same product (there is normally room at the top).
(4) i order my wife's, kids and my shoes by style and then by colour.
I guess everything is about grouping with me.
The bad guy in Sleeping with the Enemy has nothing on me