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A Practical Guide to Disruption and Productivity Loss on Construction and Engineering Projects by Roger Gibson

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Appendix 1 Definitions and Glossary

This Appendix provides definitions and explanations for words and expressions commonly used in delay and disruption situations.

  • Acceleration: taking or planning active measures to complete work ahead of the project programme and/or to recover delays. Such action usually increases the overall cost of the project. See also ‘Mitigation’.
  • Accepted Programme: a programme submitted by a contractor, or subcontractor, for the whole of the works for acceptance by the CA (or similar). Once accepted by the CA, it is known as the Accepted Programme.
  • Activity: an operation or process in a project that consumes time and also usually consumes or uses other resources, e.g. people, materials, equipment. An activity is a measurable element of the total project programme but, depending on the hierarchy or level of detail of the programme, may be divisible into smaller or more detailed activities. See also ‘Task’.
  • Activity Duration: the time calculated or estimated to carry out an activity, generally taking into account a specific level of resource.
  • Activity ID: a unique code, usually alpha-numeric, that identifies each activity in a project.
  • Activity-on-Arrow Network: a network technique that uses arrows to represent activities. Preceding and succeeding activities join at nodes or events.
  • Activity-on-Node Network: a network technique that uses cells (generally symbolised by ‘boxes’) to represent activities. Also known as a Precedence Diagram.

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