CONSTRUCTION SCHEDULING

steps to effective time management

• Examine the Contract• List Major Contractual Obligations • Divide Project into Major Work Areas • Building Technology Implies Sequence • Find Productivity, Duration, Cost• Calculate Initial Schedule • Schedule Adjustments • Resource Evaluation • Time / Cost Trade-off • Total Project Cash Flow • Include All Important Procurement

Project Network Diagrams

• Network diagrams show the precedence relationships among activities

• It’s easier to understand these relationships graphically

• Network diagrams help to understand the flow of work in a project

• Network diagrams are a useful tool for project planning and control, as well as for scheduling

• One (perhaps exaggerated) claim is that the network represents ¾ of the planning process

Two Versions of Network Diagrams

Activity-on-Arrow (AOA) networks– also called Arrow Diagramming Method

(ADM)– simpler for projects with many dependencies– emphasizes events; milestones can be easily

flagged– sometimes requires dummy activities

Two Versions of Network Diagrams

• Activity-on-Node (AON) networks– also called Precedence Diagramming Method

(PDM)– easier to draw for simple projects– emphasizes activities– no dummy activities

Activities vs. Events

• Activity – a chunk of work that is part of the project; an activity may be broken down into multiple subactivities

• Event – a significant point in time during the project, such as a milestone event; an event could be the time at which an activity is completed or the time at which related concurrent activities have all completed

• Dummy Activity – an artificial activity with zero time duration that only shows a precedence relationship among activities

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