The project used as an example is the construction of a prestressed concrete girder bridge of three 30 m spans, with a cast-in situ deck, supported on two river piers and two abutments on level banks (Antil and Woodhead 1990). The piers and abutrments have precast concrete pile foundations, with pile caps below water level, each, therefore, requiring cofferdamas. A girder casting yard was necessary on the site, and the prestressed girders could easily be transported by trolleys running on rails across the flail banks and over the river on falsework. The concrete piles were to be supplied by the owner 15 days after moving-in tasks had begun. A 40 h work week was originally considered for all activities except for pile driving and constructiom of the cofferdam for which a 45 h week was planned. Indirect cost and overhead were originally estimated at s360 working day.