Seniors value their independence, being able to do things around without relying on others help. A problem with this would be deteriating strength and co-ordination. Let's take grocery shopping. Bought all the groceries, move the groceries to the car. It would be tough to put the bags in the trunk, move the cart back, then move the bags when you get home. Thus, we've decided to make a grocery cart that can automatically put the groceries into any trunk, climb stairs, etc.