Creating a Lean Culture, 3rd Edition

Leading a Lean Operation ◾ 235

By comparison, when considering daily pitch attainment percentage, the

time period in question is usually a shift, which batches the pitch-by-pitch

results. This is the same effect as reporting an average for the shift rather

than showing an hour-by-hour or pitch-by-pitch performance profile.

Inother words, this kind of reporting, even though based on frequent

measurement, has the effect of lumping the data points together, smooth-

ing over problems and making it more difficult to see them clearly. As with

any other example of batching, process problems are hidden in the batch.

The problems could be bad parts, late inpatient discharges, inaccurate speci-

fications, delayed procedures, incomplete information, inc ...