A Psycholinguistic Model of How the Human Brain Processes Language by Dr. Ed Vavra
     I am unaware of any other approach to teaching grammar that is based on a model of how our brains process language. In other words, how do our brains make sense of the stream of words we hear or letters we see? KISS is based on such a model, and that model underlies almost everything in KISS, including what are, and what are not "errors." I have been told by one educated adult that college students can't understand the model as it is on this site, but my experience has been different. Students get the idea that words in sentences "chunk" to other words to form phrases, and phrases chunk to other words (or constructions), until everything chunks to a main subject/verb pattern. I suggest, therefore, that the sooner students are introduced to the model, the more meaningful they will find what they are learning in KISS. 
     This model has been redone (and amplified) as a 19-page MS Word document. Click here to get a copy. If there are requests, I can also post it here as an Adobe pdf file.

--Dr. Ed Vavra