Glenday Sieve (GS)

An analysis technique that allows practitioners to prioritize and target improvement efforts on a few high-volume procedures, processes, units or activities (PPUAs). As seen in the table below, GS maintains that in most cases about 6 percent of PPUAs account for about 50 percent of volume. Additionally, GS classifies and color-codes all PPUAs into four different volume groups. For example, if a manufacturer makes 200 different parts, GS maintains that approximately 12 parts account for 50 percent of sales; these 12 parts would be in the green group and would ideally be the focus of any initial improvement activities, as they would yield the greatest benefit.

Cumulative Percent of Volume	Cumulative Percent of PPUAs	Color Code
50 percent	6 percent	Green
95 percent	50 percent	Yellow
99 percent	70 percent	Blue
last 1 percent	30 percent	Red