The Karhard Defects Quartet is a creative card game developed by Karhard Design. It is a humorous and playful examination of the typical defects and challenges that can occur in construction projects. The quartet was originally developed as an ironic commentary on the reality of the construction and design industry and has achieved cult status among architects, clients and design enthusiasts. There is the defects quartet, the defects list, a defects scale and a defects guide.