Functions

Must Have
Physical 

1. Detect whether user is trying to leave
   2. Able to talk
   3. Able to play music
   4. Able to move 

Cognitive

1. Understand what the user says
2. Able to hold a short conversation
3. Able to alert the caretaker if user wants to go out and robot is unable to stop them

Should Have
Physical

1. Should be able to touch the user
   2. Play music according to certain activity or time of day

Could Have

Won't Have

1. Database with user's information