There are two basic types of human knowledge: explicit and tacit knowledge. Explicit knowledge is codified and consists of facts, rules and procedures and its owners are aware of it. Tacit knowledge helps its possessors to use their explicit knowledge. Personal experience, perceptions, insights, aptitudes and know-how that are implied or indicated but not actually expressed — they are hidden in the minds of their owners. Explicit knowledge has no meaning without relevant tacit knowledge; it remains a collection of memorized pieces of mosaic. Good teaching methodologies must develop and enhance both forms of learners' knowledge. In our paper, we study the difference in between their delivery in traditional (on-site) learning and e-learning. We concentrate primarily on tacit knowledge delivery because our long-time e-learning experience shows that there is almost no difference between traditional learning and e-learning in delivering explicit knowledge. The presence or absence of the educator may result in big differences in students' tacit knowledge. E-learning educational methodologies should concentrate on its development. The authors designed and developed a method based on best practices of Knowledge Management, in particular on the Nonaka-Takeuchi SECI model of learning. It combines gaining of both tacit and explicit knowledge during four stages: Socialization, Externalization, Combination, and Internalization. Each of them requires specific teaching activities for its development. Socialization evolves communication with the educator as well as among students; Externalization helps the students to express their knowledge in a legible form. During Combination the students evolve their existing knowledge and share it with their classmates. During Internalization they co-opt their knowledge to make it an integral part of their individual knowledge system. Every e-learning course must demonstrate all of these components — naturally, in different formats depending o...