The alternate algorithms of retained logic and progress override were developed tobe utilized on the original ADM (arrow diagramming method) format for CPM. It wasunderstood by initial developers that neither choice was correct but merely set options to beoverly pessimistic or optimistic. Improvements in computers enabling solution of PDM(precedence diagramming method) logic networks implemented only these choices withoutregard to other aspects of the PDM format.A solution avoiding either bias is posited in this paper, and is called by the author a ModifiedOut-of-Sequence Algorithm. While both retained logic and progress override algorithms involveuse of the traditional finish-to-start form of restraint, the modified out-of-sequence algorithmalso utilizes a finish-to-finish form of restraint. The protocol was first suggested by the author in2004 and published in 2005 (and 2010) in CPM in Construction Management, 6th and 7theditions.
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