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The point is, an organization cannot go to Level 4 overnight, and the
focus is on the data.
What problems do we see in organizations when they decide to move from
Level 3 to Level 4? At Level 3, measures are collected and preliminary thresholds
are established, usually relating to size and effort. If the thresholds are exceeded,
some sort of corrective action is undertaken. At Level 4, the control limits are based
on years of historical data and trends analyses done on those data. More data are
collected, and, therefore, more limits are established, monitored, and refined as necessary.
At Level 3, the data may be somewhat inconsistent and ???dirty.??? Although in
a perfect world we would like to see ???clean??? data at Level 3, the focus on Level 3
is on organizational process, not necessarily on stabilized, normalized, statistically
accurate data??”which is exactly what Level 4 expects. One problem that we see in
some organizations that have barely met the criteria for Level 3 is that the processes
are not always followed consistently across the organization.


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