http://www.its-about-time.com/iat/5e.pdf

The 5E learning cycle model requires instruction to include the following discrete elements: engage, explore, explain, elaborate, and evaluate.
it is a method of instruction, or instructional model that can be very efficient to implementing lessons.

the article tells of 7e now.
The proposed 7E model expands with extra 2e —elicit and extend.

you can read more on my blog
http://sgeducation.blogspot.com/2010/07/developing-integrated-blended-learning.html