2007 – Development of a Multivariate/Multi-Level Model Examining the Impact of Middle Grade Structures, Organizations, and Practices on Student Outcomes Posted on 20072017 by danzap@illinois.edu Development of a Multivariate/Multi-Level Model Examining the Impact of Middle Grade Structures, Organizations, and Practices on Student Outcomes Mertens, SB, Flowers N, Hesson-McInnis M, Bishop C