Glossary - Construction Project Scheduling and Control - page 477

Potential contractors have to assume the remaining 70% information. Further
stages follow with the percentage increasing, for example, DD60, DD90,
indicating more design information has been determined. The final design is the
third and final phase of the design process. It follows design development.
Direct Cost —Cost that is directly associated with a specific activity or work item. It
typically includes labor, materials, equipment, and subcontracts.
Dispute Review Board (DRB) —A panel of three experienced, respected, and
impartial reviewers, organized before construction begins, which meets at the
job site periodically. The DRB is usually formed by the owner, who selects a
member to be approved by the contractor, the contractor selecting a member to
be approved by the owner, with the two chosen members selecting the DRB
chair, to be approved by both parties. The board becomes familiar with the
project and its development by meeting regularly. It helps prevent and resolve
disputes between the contracting parties.
Dissolve an Activity —A function in Primavera software that deletes an activity but
assigns its predecessors to its successors so that there won't be an interruption in
the logic of the schedule.
Double-Restricted Float (in Precedence Networks) —The amount of time we
have to delay the rest of work in an activity after it has started on its critical start,
then finish on its critical finish date without delaying the entire project.
Driving Relationship —A relationship from a predecessor activity that controls the
start or finish of a successor activity. For any activity with predecessors, there
must be at least one driving relationship.
Driving Resource —A resource that determines the duration of an activity to which
it is assigned. The activity duration is calculated based on the resource
availability and resource quantity needed to complete the activity.
Dummy Activity —A fictitious activity with zero duration and no budget or
resources assigned, used in Activity on Arrow Networks to maintain correct logic
or distinguish activities' identities.
Duration —See Activity Duration .
Dynamic Minimum Lag (DML) —A new type of logical relationship in Critical
Path Method (CPM) scheduling. A DML relationship is dynamic; it moves along
the activity in parallel to work progress to make sure the minimum lag is
maintained at all times, not just at the start of finish.
Early Dates (for an activity) —The Early Start date and Early Finish date of an
activity.
Early Finish (for an activity) (EF) —The earliest date on which an activity can
finish within project constraints.
Early Start (for an activity) (ES) —The earliest date on which an activity can start
within project constraints.
Earned Value (EV) —See Budgeted Cost for Work Performed (BCWP) .
Earned Value Analysis (EVA) —Analysis of a project's progress to discover how the
actual money was budgeted and spent as compared to the value of the work
achieved.