November 2002
Intermediate to advanced
256 pages
4h 32m
English

Photo by John Collier. Library of Congress, Prints & Photographs Division, FSA-OWI Collection, Reproduction Number: LC-USW3-010723-C.
Montour no. 4 mine of the Pittsburgh Coal Company. There are miles and miles of track in a mine, and the maintenance of the roadbed, ballast, and switches keeps a crew working constantly. Pittsburgh, Pennsylvania (vicinity), November 1942.
Some development tasks take a long time to implement, and intermediate steps are potentially disruptive to an Active Development Line (5). This pattern describes how to reconcile long-term tasks with an active development line.
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