This document provides an overview of the school variables and unit variables used in Phase 1 of the Individually Guided Education (IGE) evaluation. Included in the discussion of each variable are a verbal definition of the variable, a description of the distribution of the variable in the 156 schools that participated in the Phase 1 study, and the internal consistency of the variable. Also included is a discussion of a structural model that was developed as an expression of how the school characteristics measured by these variables are supposed to influence each other in an IGE school. (Author)