Usage Note
Plan covers both a scheme or strategy (un plan d'action = an action plan) and a physical map or diagram (un plan de ville = a city map, un plan d'appartement = a floor plan). In informal speech, c'est un bon plan means 'it's a good tip' or 'a good deal'. Premier plan means 'foreground'; au second plan means 'in the background'.
Examples
"Il a dessiné le plan de la maison."
Natural Translation
He drew the floor plan of the house.

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