The most common subjective forecasting techniques include the following:
- Market surveys
- Employee surveys
- Expert knowledge (Delphi method is a method using expert knowledge)
- Test marketing
Cycle counting is a periodic analysis of inventory in a storage location which is conducted through the counting of samples instead of physically counting the entire inventory available, so as to quickly have an accurate estimate of the inventory available without causing a stop to the day to day working as is the case with physically counting every unit.
The Pareto principle (also known as the 80/20 rule, the law of the vital few, or the principle of fac-tor sparsity) states that, for many events, roughly 80% of the effects come from 20% of the causes.
Weighted moving averages assign a heavier weighting to more current data points since they are more relevant than data points in the distant past. The sum of the weighting should add up to 1 (or 100 percent).
[Reference: CIPS study guide page 109-111, LO 2, AC 2.3]
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