As of now, this study includes only the four samples from the 2001 Student Guide for Arizona's Instrument to Measure Standards. Grade 5, November 1st in the KISS Grammar Workbooks includes scans of the original documents from the Arizona stnadards and material for using these passages for teaching. Four is a very limited number of samples, so I intend to find more samples and add them to this group. However, even with such a small sample, it is impossible to miss the wide range of ability among the students. 
     The material in the Workbooks includes the evaluations of these samples by the Arizona Department of Education. The writers of the first two samples received high evaluations across the board; the samples of the last two writers were considered to be "not acceptable." A major purpose of these statistical evaluations is to explore the syntactic differences in the writing of all these students to see what instruction in grammar might help them and how. Current instruction in grammar teaches constructions, and attempts to get students to use them. These often include the teaching of gerundives and appositives to fourth or fifth graders. As you explore the various statistical studies here, you may conclude, as I have, that fourth and fifth graders would be better served by focussing on adjectives, adverbs, prepositional phrases, S/V/C patterns, and some basic work with clauses.