Improving the making ready process - exploring the preconditions to work tasks in construction

Søren Munch Lindhard, Søren Wandahl

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

9 Citations (Scopus)

Abstract

Scheduling in construction is complex. Before an activity can be conducted, a number
of preconditions first have to be fulfilled. In Last Planner System this removal of
constraints is referred to as the making ready process. To ensure that this process is
running, the preconditions need to be known. Therefore, in an attempt to bring these
preconditions into light three construction projects have been followed. Here reasons
for non-completed activities have been collected. In total 5014 activities have been
registered whereof 1279 was not completed according to schedule. Afterwards the
non-completed activities were sorted into nine main categories. The six of the
categories are basically corresponding to the ones presented by Koskela (1999), while
the last three are an expansion of Koskela’s external condition category. The
preconditions are as follows: 1) Construction design and management. 2)
Components and materials are present. 3) Workers are present. 4) Equipment and
machinery are present. 5) Sufficient space for conduction. 6) Previous activities must
be completed. 7) Climate conditions must be in order. 8) Safe working conditions in
relation to national “Health and Safety at Work Act” have to be present, 9) Known
working conditions. Often a problem during excavations or refurbishment
assignments where existing conditions first has to be examined. One of the major and
underlying reasons to non-completed task is insufficient and even bad scheduling.
Often non-sound and out of sequence activities are selected to the Weekly Work
Plans. When conducting the schedule it is important to notice as described in
Lindhard and Wandahl (2011) that the soundness of an activity can vary over time.
By focusing on all nine preconditions a more robust schedule can be achieved. A
more robust schedule induces an increased percent planned completed level and
moreover and increased productivity.
Original languageEnglish
Title of host publicationProceedings of IGLC20, 20th Annual Conference of the International Group for Lean Construction
EditorsIris D. Tommelein, Christine L. Pasquire
Number of pages10
PublisherMontezuma Publishing
Publication date2012
ISBN (Print)978-0-7442-1744-5
Publication statusPublished - 2012
Event20th Annual Conference of the International Group for Lean Construction - San Diego
Duration: 17 Jul 201222 Jul 2012

Conference

Conference20th Annual Conference of the International Group for Lean Construction
CitySan Diego
Period17/07/201222/07/2012

Cite this

Lindhard, S. M., & Wandahl, S. (2012). Improving the making ready process - exploring the preconditions to work tasks in construction. In I. D. Tommelein, & C. L. Pasquire (Eds.), Proceedings of IGLC20, 20th Annual Conference of the International Group for Lean Construction Montezuma Publishing.
Lindhard, Søren Munch ; Wandahl, Søren. / Improving the making ready process - exploring the preconditions to work tasks in construction. Proceedings of IGLC20, 20th Annual Conference of the International Group for Lean Construction . editor / Iris D. Tommelein ; Christine L. Pasquire. Montezuma Publishing, 2012.
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Lindhard, SM & Wandahl, S 2012, Improving the making ready process - exploring the preconditions to work tasks in construction. in ID Tommelein & CL Pasquire (eds), Proceedings of IGLC20, 20th Annual Conference of the International Group for Lean Construction . Montezuma Publishing, San Diego, 17/07/2012.

Improving the making ready process - exploring the preconditions to work tasks in construction. / Lindhard, Søren Munch; Wandahl, Søren.

Proceedings of IGLC20, 20th Annual Conference of the International Group for Lean Construction . ed. / Iris D. Tommelein; Christine L. Pasquire. Montezuma Publishing, 2012.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Lindhard SM, Wandahl S. Improving the making ready process - exploring the preconditions to work tasks in construction. In Tommelein ID, Pasquire CL, editors, Proceedings of IGLC20, 20th Annual Conference of the International Group for Lean Construction . Montezuma Publishing. 2012