It is quite usual that change orders (or variations) occur in construction projects. However the changes that occur upfront at the beginning of a project are less likely to make a substantial impact on the cost and duration of the project than those that occur later as construction progresses. The most important factor to manage change orders and mitigating the potential impacts is to recognize the increasing impact of changes as the project progresses. Early in the project, a change may only require a small modification or clarification to an engineering drawing. However, if this same change is made later in the project, after construction has begun, it might require the demolition of existing work and rework in addition to the engineering change.

Due to this fact, it is much beneficial for owners to engage their project personnel to make thorough study and review project documents to make all possible efforts to mitigate, minimize or manage change orders during later stages of construction.