RDCPM™ — Relationship Driven CPM
By Fredric L. Plotnick, Ph.D., Esq., P.E.
Introduction
The new format of the Relationship Diagramming Method (RDM)
variant of Critical Path Methodology (CPM) of Planning and Scheduling
was introduced in 2005 in the sixth edition of the industry manual, CPM
in Construction Management. Certification of proper usage is attested to
by the RDCPM™ compliance certification symbol.
The original format for CPM, which was developed 50 years ago, has
since been renamed as Arrow Diagramming Method (ADM) to
distinguish it from the Precedence Diagramming Method (PDM) variant
which was first implemented in 1964. ADM is also known as AOA or
Activity-on-Arrow, while PDM is also known as AON or Activity-on-
Node. Another variant of the same era was Program Evaluation Review
Technique (PERT), which was developed by the U.S. Navy for the
creation of the Polaris Missile System. PERT focused more upon defined
milestones, instead of the loosely defined activities between such
milestones.
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