TABLE OF CONTENTS Step 4 requires you to determine the initial basic function from your list of initial functions. The basic function obtained initially is not always the function that should be selected to begin the logic diagram because frequently the real problem or project that should be investigated is at a higher level in the logic diagram. Therefore, subsequent steps are used to make sure that the real problem or project is identified before effort is devoted to the logic diagram. If the Basic Function Determination Question yields all "no" answers, then the initial basic function has been found. After you have identified the initial basic function, place an asterisk (*) in front of it in your list of functions. The following Basic Function Determination Question is used to obtain the initial basic function:
If this function didn't have to be performed, would any of the other functions still have to be accomplished or performed?
That function in turn is used to search for higher level functions.
Obviously, the purpose of a lightbulb is to "produce light." Therefore, if we insert this function into the Basic Function Determination Question, we obtain:
| Q | If we didn't have to produce light, would we still have to perform the other functions listed? |
| A | No, if you look down the list of other functions listed in Figure 8.5. This is the answer you obtain for each function. |
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