ABSTRACT
In every construction project the expected output
per time unit (hour or day), usually termed pro-
ductivity, determines the cost and the duration of
construction activities (Park, 2006). Productivity is
influenced by both managerial decisions and the
dynamically changing operational conditions. The
latter seems to be rather critical in the pre-project
phase where focus is put on deciding the construc-
tion technique and on improving the efficiency of
operations (Kotte, 1997). Irrespective of the pro-
ductivity estimation methodology selected, a tena-
cious issue is the inclusion of the operational factor
variability (Schexnayder, 1997). Consequently,
productivity assessment presupposes answers to a
number of related questions such as:
1. What are the key operational factors that affect
productivity?
