It's a term in interior design that we will draw a sketch either hand-drawn or from computer on a empty floor plan to show you the position and rough shapes of various areas and/or joinery items so that our client would under which area on the plan is for what functionality, here we also call it space mix. For example, in retail shops, we will divide the space to Front of House which is your traditional trading floor, and Back of House which is your Admin and Kitchen space. In front of house, depending on the nature of your store, we then include different areas, say in a cafe, we will include customer seating areas (different seating arrangements), coffee counter for equipment, transaction counter, feature walls... to name a few.