This book proposes a novel mode of knowledge management tools -- knowledge recommender systems (KRS), which can recommend proper knowledge to proper users in proper context. Nowadays, knowledge query systems are the most common mode of knowledge management. However, when users undertake some knowledge-intensive tasks, e.g., product innovative design, the users often do not know which keywords should be keyed in for searching their wanted knowledge through the conventional query systems. Moreover, by using the query systems, the obtained results are usually within the predefined scopes or...