The overall function can now be broken down into an appropriate number of smaller functions which indicate the logical and physical relationships between the flows and conversions of material, energy and signals. There is generally an identifiable main flow which dominates the situation, plus a number of supporting auxiliary flows. The character of a function is usually indicated by "imperative + object", for example "Adjust settings" or "Convey cuttings". The arrangement of functions can be varied to determine the most favourable function structure, remembering that the solution must eventually be embodied.
There are two different types of function structure:
• System function structure
• Process function structure
When preparing a system function structure, the system boundary is drawn around the "device", for example the grass cutter, and the relevant inputs, outputs and functions defined as shown in Figure 12.
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