Knowledge management is a novel strategy intended to capture and re-use knowledge that has been obtained, e.g., in previous design projects or during the operational stages of a chemical plant. Knowledge management allows dealing with explicit, quantitative data as well as with implicit, tacit knowledge. A tool, Piquar (Plant design Improvement by QUAlity Review), has been developed that supports and stimulates identification and consideration of both kinds of data and knowledge in the chemical plant design process, which may result in higher quality plant designs. Piquar has been evaluated positively by experts from industry and by a design team, and it is regarded to be a useful tool in the process designer's toolkit.