Uncertainty and irreversibility are central to online learning projects, but have been neglected in the existing educational cost-benefit analysis literature. This paper builds some simple illustrative models of the impact of irreversibility and uncertainty, and shows how different types of cost and demand uncertainty can have substantial impacts…

The study reported here concerns the development and predictive validation of an instrument to assess the achievement outcomes of DE/online learning success. A 38-item questionnaire was developed and administered to 167 students who were about to embark on an online course. Factor analysis indicated a four-factor solution, interpreted as "general…