impact of 4d modeling on construction planning process - Chalmers ...

Andersson & Christensen (2007) claimed that CPM is unable to cope with resource
constraints as regards repetitive activities. Whereas CPM presumes that resources are
unlimited for constructing the jobs, this is not true in reality. Consequently, it is
impossible to foreseen whether there are shortage in resources or conflicts between
work tasks concerning the ultilization <strong>of</strong> resources. This problem will lead to
disruptions in construction processes and thereby delays can be unavoidable.
Additionally, in a construction project, same activities can be performed at different
locations in construction site and at the same time whereas CPM fails to deal with
such type <strong>of</strong> work tasks.
3.1.2.3 Linear scheduling method/Location-based scheduling
Linear scheduling method (LSM) and also called location-based scheduling (LBS)
was firstly formulated in the early 1950s (Andersson & Christensen, 2007). It is
mainly applied for construction projects such as multiple housing units, railway,
highway and high-rise building. LSM supports planners to avoid creating schedules
that can cause conflicts between repetitive activities and to ensure the continuous flow
<strong>of</strong> resources working during the project life cycle (Nunnally, 2007). However, LSM
has not achieved much concentration from construction actors. One <strong>of</strong> the main
reasons is that it is very difficult to change the level <strong>of</strong> detail for information once
they have been put in the schedule. Additionally, LSM s<strong>of</strong>tware also requires a large
amount <strong>of</strong> input information at the initial phase <strong>of</strong> planning and scheduling
(Andersson & Christensen, 2007). Below is an example <strong>of</strong> LSM:
Figure 0-5: Linear scheduling (Nunnally, 2007)
CHALMERS, Civil and Environmental Engineering, Master’s Thesis 2012:27
11