Principles for Testing a Change
Anyone who has tested a change has probably pondered whether the same results will be obtained when the change is implemented in the future. Considering three basic principles helps reduce this uncertainty: 
FIGURE 7.1. DEGREE OF BELIEF WHEN MAKING CHANGES TO IMPROVE.
Principle 1: Test on a small scale and build knowledge sequentially.
Principle 2: Collect data over time.
Principle 3: Include a wide range of conditions in the sequence of tests.
Principle 1: Test on a Small Scale and Build Knowledge Sequentially
Knowledge is built iteratively by making predictions that are based on the current theory, testing ...
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