A theory of treatment numerous calendars in construction projects scheduling

W. J. Hilo, K. A. Rashid, Amiruddin Ismail

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study exposes the algorithms involved in the utilization of numerous calendars in construction projects scheduling. Scheduling with numerous calendars considering weekend, holidays and exceptions is more realistic than scheduling with continuous working days. Although Primavera Project Management, Primavera Suretrak and Microsoft Project employs numerous calendars, the basic theories have not been disclosed to public. This study provides how the Critical Path Method (CPM) forward and backward passes with numerous calendars are handled in scheduling through the examination on the calendar operations of Primavera Project Management version 6.1 (P6.1). Also, the theory covers all four relationships finish to start, finish to finish, start to start and start to finish with lags of zero, positive and negative values. It has been noticed that P6.1 operations with two calendars may generate a wrong results in all negative lags relationships and with zero lag for start to finish relationship. Also, when nonworking days are involved, the early time of an activity in the forward pass is the maximum early time among all possible early times calculated from predecessors. Each possible early time is calculated based on two calendars, one for the predecessor and the other for the successor. This study could help scheduling engineers understand and analyze numerous calendars by showing the computations and assumptions currently being made by P6.1 anecdotally the most widely used scheduling software in the architecture, engineering and construction industry.

Original languageEnglish
Pages (from-to)2343-2357
Number of pages15
JournalJournal of Applied Sciences
Volume10
Issue number20
Publication statusPublished - 2010

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Scheduling
Project management
Construction industry
Engineers

Keywords

  • Critical path
  • Early/finish time
  • Non-workdays
  • Scheduling

ASJC Scopus subject areas

  • General

Cite this

A theory of treatment numerous calendars in construction projects scheduling. / Hilo, W. J.; Rashid, K. A.; Ismail, Amiruddin.

In: Journal of Applied Sciences, Vol. 10, No. 20, 2010, p. 2343-2357.

Research output: Contribution to journalArticle

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