Abstract
This is the last of a series of four articles, in six parts, concerned with the statistical reporting experience of the WPB and its predecessor agencies. In this article there is presented an analysis of a few of the outstanding tabulation problems of the WPB and its principal tabulating agent, the Bureau of the Census. In addition, the series is concluded with a statement of a few outstanding lessons which the WPB's statistical experience has revealed to be strategic in the establishment of a suitable emergency industrial statistical reporting program.