Developing quality content may be the most difficult and costly task of developing a computer-based courseware. Despite this, little has been done to support the reuse of this material. In this paper we propose a particular way of structuring a courseware to conform a lesson unit in order to facilitate the use of the unit in different situations as well as the use of the material in different lessons. This is based on structuring a lesson’s computer-based learning material as a “didactic network”. A didactic network is a semantic network which represents the lesson unit. Although this approach was not developed exclusively having the wireless and mobile scenario in mind, it is a good example about developing courseware which should be used in different situations, including the mobile scenario.