Business Models Canvas: A one pager that can gain more alignment and force than a 90-page business plan. A visually interesting one pager that is read more than many lines of text.
Your Value or Elevator Pitch is the most challenging. It is the value to the user, stated in terms of a problem your product is solving for the user.
Then, Customer Relations might not refer to what you think. Does your product act like a personal assistant to the user [Consultants]? Or does your product offer value by asking the user to be more self service [Ikea]?
Last, Customer Segments is interesting. Is your product mass market or does it target a niche market? Only segment customers if some of them behave differently than others, and you have to talk to them differently [new users v brand advocates v lapsed users].