Resource Requirements for Block Foundations
placing concrete block foundation walls, a typical crew would consist of three
bricklayers and two bricklayer helpers. If sufficient space was available on
the site, several crews could work on the same job at the same time, thereby
speeding up completion of the activity in proportion to the number of crews. In
more restricted sites, multiple crews might interfere with one another. For
special considerations such as complicated scaffolding or large blocks (such as
twelve inch block), a bricklayer helper for each bricklayer might be required
to insure smooth and productive work. In general, standard crew composition
depends upon the specific construction task and the equipment or technology
employed. These standard crews are then adjusted in response to special
characteristics of a particular site.
In addition to precedence relationships and time durations, resource requirements are usually estimated for each activity. Since the work activities defined for a project are comprehensive, the total resources required for the project are the sum of the resources required for the various activities. By making resource requirement estimates for each activity, the requirements for particular resources during the course of the project can be identified. Potential bottlenecks can thus be identified, and schedule, resource allocation or technology changes made to avoid problems.
Many formal scheduling procedures can incorporate constraints imposed by the availability of particular resources. For example, the unavailability of a specific piece of equipment or crew may prohibit activities from being undertaken at a particular time. Another type of resource is space. A planner typically will schedule only one activity in the same location at the same time. While activities requiring the same space may have no necessary technical precedence, simultaneous work might not be possible. Computational procedures for these various scheduling problems will be described in Chapter 2. In this section, we shall discuss the estimation of required resources.