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5.1.1. TRIZ Principles: Function
How To Invent (Almost) Anything > 5. Basic TRIZ > 5.1. TRIZ Principles > 5.1.1. TRIZ Principles: Function < Prev Chapter | Next Chapter >
All parts of a device perform functions. Whenever something happens, a function has been performed. There are primary functions, which perform the main desired effects, and secondary functions, which support the primary functions (note the similarity with primary and secondary functions of Value Analysis in Chapter 1). To find out what is happening, you can use chunking (as in Chapter 1) to either zoom in to the detail (even to the molecular level) or out far enough to see the big picture.
To identify functions, look at what is being done and the results of those
actions. Results of an action produce change of some sort, which hopefully is
what is required. To assess the change, it should be measurable, which means it
will have a value and units, such as of heat, shape, motion, energy, etc. Other principles
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