Another technique is called Product

Another technique is called Production Analysis Control Technique (PACT)—"the basic concept is to forecast production slippages in ample time to take corrective action. It is designed as a decision-making tool to permit management to make the nec-essary decisions to keep deliveries on schedule, rather than as a diagnostic tool to aid in determining why schedules have slipped after the fact.'
SPECTRO is a computerized network-type management control system, using a milestone concept for control points. The system provides the normal information required by manage¬ment for schedule planning, evaluation, cost, and control. In addition it provides the means for modifying plans and observing the results of this modification before implementation.'
SCANS is an acronym derived from Scheduling, Control,
Trod:ft-lion 41114 Analysis Control Technique, Special Projects Office, Program Eval¬uatio!, Branch, Department of the Navy, Washington, f.eb. 8, 1961, p. 1.
'Thomas V. Sobczak, "A Look at Network Planning." IRE Transactions, September 1962, p. 115.

and Automation by Network System. The SCANS system was designed to provide a management control system which would integrate scheduling, costing, and manpower loading in a mean¬ingful manner, one that provided for tradeoffs between functions."
Resource Allocation and Multi-Project Scheduling (RAMPS) considers restrictions such as quantity of resources available, priorities, and "resource team" composition required for an in-dividual task. Penalties for delayed completion, overtime labor, subcontracting, inefficient utilization rates, and related factors are incorporated in the procedure. Considering these re:trictions and requirements, RAMPS seeks the schedule which satisfies various criteria including minimum cost.'
These examples of network techniques are typical of many approaches which have been used in military and industrial applications. It is safe to say that most examples are basically the same and only the acronyms differ. Inasmuch as the PERT tech¬nique was one of the first, and also the most widely accepted, we will use it to illustrate networking.
A PERT NETWORK
The Pert network is the working model of the technique. It illus¬trates, by diagram, the sequential relationships among the tasks which must be completed to accomplish the project. PERT treats planning and scheduling separately. First the plan is developed, and then the limitations are added to the problem.
Gathering Preliminary Data