An information model for the entire business helps establish a common understanding of concepts and terminology.

I usually draw information models using UML:

I also catalog information entities with details about content (properties, or attributes) and relationships.

HotelThe business – or enterprise.Name.Rooms, bookings, and guests.
RoomRooms for rent.Number.Stock.
StockContents of the minibar.Name, Price.
BookingReservations.Arrival and departure date.Charges.
ChargesRestaurant bills and purchases from the room’s minibar.Date, amount.
GuestGuests.Name.Bookings, charges.