Logic Nework

several different companies is required to ensure that you can maintain the schedule. Rough level II schedules coordinate the planning effort between companies and ensure that no particular company or rating is overtasked during any phase of the deployment. Good coordination in the beginning is less painful than a major overhaul later. Having determined the sequence and approximate duration of each master activity, you can construct a level II barchart. Each project will have a level II. The 0ps officers and the company commanders typically track projects using a level II. Barcharts will be covered in greater detail later in this chapter. LOGIC NETWORK The logic network is the basic management tool for control, monitoring, and distribution of all resources that are directly related to time. The logic network at the planning stage is a pure dependency diagram. All activities are drawn in the order in which they must be accomplished, without regard to particular construction preference. One of the major uses of the logic network during the planning stage is to indicate all activities that must be accomplished to complete a particular project (fig. 2-11). The individual network activities should be well-defined elements of work within the project and should be normally limited to a single rating. As a general rule, an activity should be created for any function that consumes or uses direct labor resources. Resources (manpower, equipment, tools, or materials) MUST be tied directly to the CAS sheet and network. The crew leader constructs a logic network showing the sequence of construction activities from the first to the last and the dependencies between activities. It is important to do the logic network when breaking the project down into construction activities to ensure no items of work are left out. You do not yet have construction activity durations, so you are only concerned about the sequence of work. Each construction activity is represented by an activity block. in the network shown in figure 2-11, activities 1020 and 1030 cannot start until activity 1010 is finished. Activity 1040 cannot start until 1020 is finished, and activity 1050 cannot start until 1030 and 1040 are finished. THE BASIC SCHEDULE (FORWARD AND BACKWARD PASS) Using the crew sizes, you can now determine construction activity durations. Go back to the logic diagram and insert the durations to determine the basic schedule. Practice with the example here and those included later. Some minor revisions may be required to the basic schedule (see resource leveling) prior to setting the final schedule. On the precedence network you will need to insert into an activity block the activity number, description, and duration for each activity. A typical block is shown in figure 2-12. Figure 2-12.—Typical activity block. Figure 2-11.—Logic network. 2-15