What type of knowledge is difficult to express and often resides in individuals' minds?

The concept of knowledge residing in individuals' minds and being difficult to articulate aligns with the definition of tacit knowledge. This type of knowledge is inherently personal and context-specific, encompassing insights, intuitions, and experiences that individuals acquire over time. Unlike explicit knowledge, which can be easily documented, stored, and shared, tacit knowledge is nuanced and often challenging to communicate through conventional means. It can involve skills, habits, and the unquantifiable understanding that individuals develop through practice and interaction in specific situations.

In the context of the other types of knowledge, structured knowledge refers to information that is organized and easily accessible, whereas explicit knowledge is knowledge that can be readily articulated, codified, and shared. Data knowledge, while it may refer to the understanding of data itself, does not specifically capture the essence of personal, experiential knowledge that tacit knowledge represents. Thus, the answer accurately highlights the nature of tacit knowledge as being complex, nuanced, and largely internalized, making it more challenging to convey compared to other forms of knowledge.