What is the theoretical framework of Walberg`s Learning Environment Inventory?

In our last session, I was wondering about the theoretical framework that supported both the instruments (CES and LEI) in the journal articles presented by MEM 858 (Groups 1 and 2). In Walker`s (2004) article, Walker quotes Moos (1979, p.138), that the early classroom learning inventories, before the Classroom Environmental Scale (CES) was introduced, “lacked the guidance of theoretical frameworks producing isolated findings that are difficult to organize into a coherent body of knowledge about classroom functioning”. According to Walker, after the introduction of the CES, and all the other classroom environment instruments thereafter, the framework used was of the common beta press and alpha press along with Moos` framework (1974) of dimensions of environment of Systems Maintenance and Change, Relationship, Personal Relevance. This provided the framework when studying the psychosocial environment in the educational set-up.