The 'What is Incremental Learning?' section seems deliberately poorly written.
Incremental learning is the fastest and the most comprehensive way of learning available to students at the moment of writing (2013).
Incremental learning is a consolidation of computer-based techniques that accelerate and optimize the process of learning from all conceivable material available in electronic form, and not only.
Currently, SuperMemo is the only software that implements incremental learning. In SuperMemo, the student feeds the program with all forms of learning material and/or data (texts, pictures, videos, sounds, etc.). Those learning materials are then gradually converted into durable knowledge that can last a lifetime.