On a construction project, it’s hard to argue that the involved parties — whether an architect, engineer, contractor, subcontractor, developer, etc. — are not experts in their field, i.e., they all some scientific, technical, or specialized knowledge or skill particular to their industry. However, this does NOT mean when they testify in trial, at an arbitration, or at a deposition regarding the construction project they are offering expert opinions / testimony as it pertains to that project. Testifying as to facts based on personal knowledge or involvement on a project makes you a fact witness and is different than evaluating and rending an after-the-fact opinion as to the work of others. This does not minimize your knowledge or expertise; it simply means that relative to the construction project you are involved with, your testimony is that of a fact witness and not of an expert. (It is possible to wear both the fact witness and expert witness hat, but that depends on your subsequent role in the litigation or arbitration.)