The personalized knowledge that people carry in their heads. Tacit knowledge is more difficult to formalize and communicate than explicit knowledge. It can be shared through discussion, storytelling, and personal interactions. There are two dimensions to tacit knowledge: (i) a technical dimension, which encompasses the kind of informal personal skills or crafts often referred to as know-how; and (ii) a cognitive dimension, which consists of beliefs, ideals, values, schemata, and mental models that are ingrained in individuals and often taken for granted (Asian Development Bank 2009).