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T HE H IERARCHY OF S CHEDULES

T HE H IERARCHY OF S CHEDULES. BAR CHARTS. A graphical representation of a project in which activities types and duration represented by bars proportion its duration. Limitation of the Bar Chart 1. Difficult to decide the order of each activity

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T HE H IERARCHY OF S CHEDULES

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  1. THE HIERARCHYOF SCHEDULES

  2. BAR CHARTS • A graphical representation of a project in which activities types and duration represented by bars proportion its duration. • Limitation of the Bar Chart 1. Difficult to decide the order of each activity 2. Force the planner to choose large scope activities 3. In the selected large activities, there are a great deal of overlap 4. The relationship among the activities cannot be shown

  3. BAR CHARTS (cont.) • Advantage of Using the Bar Chart 1. Easy to understand by all levels of construction project 2. It shows the total plan in compact format

  4. NETWORKS • Definition A network consist of two basic elements, nodes and links between these nodes. • Arrow Diagram Various building activities can be represented by the links of the network and the relationship between them is represented by nodes. • Precedence Diagram Activates represented by nodes and links represent the relationship.

  5. PLANNING RESOURCES 1. Materials Need to determine • Quantities takeoff • Availability and probable delivery time • Type of materials 2. Equipment • Selection of the type of equipment • Availability and delivery time • Decision for purchase or renting

  6. PLANNING RESOURCES (cont.) 3. Manpower • Crew size • Availability • Time required to perform activity 4. Money To pay and need immediate bills 5. Time • Beginning • End date • Milestones

  7. PROJECT BREAKDOWN • Construction stages can be broken down into many operations that define the major elements to be performed • The Single Relationship • Each activity must be selected so that all the previously required activities must be completed before the chosen one can begin and all the following activities cannot be started until the chosen one is complete • Finish to start relationship

  8. PROJECT BREAKDOWN (cont.) • Activity Definition • An activity is a unique unit of the project which can be described within prescribed limits of time • Dummy Activities An activity having a zero duration used to: 1. To establish proper logic 2. To maintain the numbering system 3. To mark milestones

  9. Shingle Roof Layout Cast Floor Slab Erect Frame Place Siding Hang Door Paint Arrow Diagram for a Small Garage Place Siding Cast Floor Slab Erect Frame Hang Door Layout Paint Shingle Roof Precedence Diagram for a Small Garage

  10. DEVELOP ACTIVTITY SEQUENCE Once the activities have been identified and duration’s estimated, the next step is to determine the sequence that activities will be performed during construction. Activity sequencing needs to take into account the relationships between activities. There are four types of relationships that need to be taken into account. • Physical Exists between two (or more) activities when one cannot start until another is partially or totally complete (i.e. cannot pour footings until they have been formed)

  11. DEVELOP ACTIVTITY SEQUENCE (cont.) • Safety Exists when simultaneous performance of two activities can result in a safety hazard (i.e. in multi-story construction it is at times unsafe for crews to be working under another.) • Resource Due to limited resource availability, two activities may not be able to use a resource at the same time (i.e. A crane cannot be used for both pouring walls and erecting steel.) • Preferential How the contractor wishes certain activities to be sequenced

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