Introductory reference material in the Appendix sections has awful very rough draft status. It is useful only as far as it points to some real reading. The learning environment designer must take into account both perspectives. WWW-based courseware must not restrict itself to delivery of educational content. It must be grounded in some model of instruction and learning.
Many possibilities exist and haven proven to be effective.
However, each paradigm works under certain conditions in certain situations using some set of specific educational technology. Reading or seeing does not imply much learning. Even being able to recall knowledge does not mean being able to apply knowledge. Efficiency is not measured by mastery of the exercises and tests of a courseware tool, but my mastery of the task. No doubt that this is the reason why all the various branches of learning theory do not even view the problem from a same angle.