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In summary, remember to look for three-dimensional measures of impact: business performance, technical or process improvements, and customer satisfaction. Establish solid baseline data before you start measuring the impact of changes. Without a baseline, there's no way to know if your changes have helped or hindered the process.
Also, remember that external economic and business factors can make good numbers look bad and vice versa. Process improvements need to be measured over a long enough period to account for cyclical variations in business performance.
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