This KPI was mentioned with positive connotations 17 times. The following are some examples of these positive effects: “project was two months ahead of schedule” and “significant time savings once the construction model took shape” (Research 2 – McGraw-Hill, 2009) or “without [BIM], it would have taken two months to design this scheme, and we were able to do it in a couple of weeks” (Aylesbury Crown Court – McGraw-Hill, 2010a).
The negative effects on time from the case studies are again much less than the positive ones. They were only mentioned 4 times and only 3 projects mentioned more negative effects on time than positive ones. These negative effects were generally related to extra time needed for “creating the initial model” (Festival Place - BSI, 2010) or “restructuring the drawings” (Palace Exchange – BSI, 2010). All 4 mentions to negative effects of BIM on time, were actually related to extra time needed to model the project or rework that needed to be done due to converting the project from traditional CAD standards to a BIM platform.