A method is disclosed for structuring a function plan into function plan sections. The function plan includes function modules. Individual function modules are connected to at least one other function module of at least one function module connection. If the function plan exceeds the predefined area of the function plan section, a first determination of the arising function module external connections in an assignment of the individual function modules to the individual function plan sections occurs for each function plan variant, and the individual function modules are assigned to the function plan sections according to the function plan variant having the least possible number of function module external connections.