For storing and set up with stamps, stickers and other multiple, small pieces, your sanity can be preserved by storing items by theme or project within a larger box of similar items.

If you keep using the same objects they will learn, by rote, how to fit them into a box, like a shoe box. I'm a big believer in transparent boxes with everyone, but especially with people functioning within ACL 4 Low. They are likely to ignore objects placed in non-transparent boxes.

The same wheeled cart used for ACL 3 supplies can be used for different boxes of ACL 4 supplies. The difference between ACL 3 and 4 is goal-directed activities. Within ACL 3, attention is captured and sustained by the action. Within ACL 4, people want to make a project or have a reason for doing an activity. The reason can be as vague as "helping someone out by …."
Supply boxes for activities in health care facilities need to be stored in a locked cabinet with extremely limited access to the key. There is no honour in the thieves of inexpensive craft and activity supplies.
The visitors supply cabinet should NOT be located near the group leaders supply cabinet, even when the group leader maintains the visitors supplies. Trust me. Friends, visitors, administrators and the entire staff will want to "borrow" everything, and things disappear by "magic." Your supplies are worse than the serving spoons for potlucks; they vanish if they are not locked up.
