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Scheduling

Learn about Activity-on-Node and AON Network construction, logic errors, numbering conventions, and critical path analysis.

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Scheduling

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  1. Scheduling CTC-415

  2. Activity Network Development • Network Models • Activity on Node • Precedence Diagram Method • Activity on Arrow • Network Characteristics • Discrete Activities • Deterministic Durations • Deterministic Logic • Activity Flow

  3. Network Elements • Activities • Basic building block • Represent tasks • Must consume time and resources • Milestones • Notice to Proceed • Building Enclosed • Substantial Completion • Project Complete • Activity Relationships • Physical, Safety, Resource, Preferential

  4. Precedence • Succeeding activities cannot start until preceding activities are finished • Changes in duration of one activity affect all succeeding activities

  5. Activity on Node • All activities occur at nodes • Arrows connect nodes and show relationships • Easy to see relationships

  6. Activity on Node • Basics: • Unique Alphanumeric identifier • Unique description • Estimated Duration • Succeeding activity cannot start until preceding activity is finished • Need beginning and ending milestone to tie project together

  7. Constructing an AON Network • Sequential logic • All activities preceding must be finished before next activity can start • Concurrent Logic • 2 or more activities can be worked at one time

  8. Constructing an AON Network • Multiple Successor Logic • 2 or more activities can be worked at one time after common predecessor is finished • Multiple Predecessor Logic • 2 or more activities need to be finished before next activity starts

  9. Constructing an AON Network • Combinational Logic • 2 or more activities can be worked at one time after multiple predecessor activities are finished

  10. Logic Errors and Problems • Incorrect Logic • Activities MUST have a logical connection • Paint color does not control the roofing application • Redundant Logic • Not incorrect • Can cause errors

  11. Logic Errors and Problems • Logic Loops

  12. Activity Numbering • Numbering Activities can make it easier to use schedule • Group like activities under the same general numbers • Activity Category • WBS can make it easy to categorize resources used to each activity • Work Classification • Numbers refer to a class of activity

  13. Activity Numbering • Location • Number activity based on location on project • Responsibility • Numbers refer to who is responsible for work

  14. Activity Numbering • Numbering Conventions • Directional • Numbers increase from start to finish of project • Numbering gaps • Leave gaps between numbers to allow for additions to schedule • Even/Odd Numbering • Even # = part of base contract • Odd # = additional work

  15. Constructing a AON • Determine the relationships between the activities • Forward Pass • Determine when each activity can start based on the finish of the predecessor activities • Backward Pass • Determine when each activity can start based on when the successor activities start

  16. Constructing a AON

  17. Constructing a AON • Critical Path • Path through schedule which provides the shortest time to complete project • Total Float • Amount of time that activity can float without impacting CP • Free Float • Amount of time an activity can be delayed without effecting the early start date of the predecessor activity

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