There is a certain zone of satisfaction where your input and effort provide an acceptable amount of satisfaction or outcome. If you expend too many resources and effort, you move out of the zone—too little outcome. If you expend too little, you move out of the zone—too little outcome. If you expect too much or too few results, you also move out of the zone. Seeing the world clearly requires having a clear understanding of cause and effect.
— Mental Models: 30 Thinking Tools that Separate the Average From the Exceptional. Improved Decision-Making, Logical Analysis, and Problem-Solving by Peter Hollins