Constructability should be an important objective in all phases of a construction project, and designers play an important role in achieving superior constructability. Most projects, however, do not receive constructability input though prior research has demonstrated the benefits of such input. One reason for this lack of constructability input, we argue, is the lack of formal, explicit constructability knowledge bases that link constructability issues to design decisions and that can be made available on-line to interested parties. This paper describes research that compiled and formalized constructability knowledge related to reinforced concrete structures. To ensure appropriate and specific constructability input, we classified the knowledge by construction methods and structural elements. To make this specific knowledge available to designers at the right time during design development, we further divided it into the five groups: application heuristics, layout knowledge, dimensioning knowledge, detailing knowledge, and exogenous knowledge. This classification leads to conclusions regarding the ability to collect and formalize this knowledge, and to make it readily available to designers to improve project performance.
