Many organizations bid on a project without adequately addressing the following important considerations:
- Collecting and understanding stakeholder requirements,
- Decomposing scope into manageable packages, breaking packages into tasks, dividing tasks into activities,
- Estimating resources,
- Estimating durations, and
- Evaluating risks.
How can you get the cost estimate right, if you miss out on these important inputs? If you get this wrong, there is little to control later. Maybe only frustration…
Something that you may hear over and over again on construction projects is statements like "The crazy HSE officers hinder us from doing our work and cost us too much time and money with their overblown requirements." Well, probably most of these requirements were even documented before bid submission and should have been considered in calculations.
Another common mistake is the inadequate consideration of time and resources. Jobs are often priced without considering relevant details:
Finish concrete wall = #m3 reinforced concrete + #m2 plaster + #m2 wall paint.
This initially looks about right, though I didn't include formworks. However, it must be remembered that between concreting and plastering, as well as between plastering and painting up to 28 days have to pass to allow for curing. Curing by the way is an activity and requires resources. But if you price a bill of quantities (BoQ) you will usually not find this. In other words, without decomposing the scope into manageable packages, estimating resources for each activity and task, and estimating their duration, there is a great possibility of overlooking it.
I hope that sounds logical, right? I can tell you, the reality is often different.