This Support Document was produced by the authors based on their research for the report, "Investigating Learning through Work: The Development of the 'Provider Learning Environment Scale'" (ED503392). While couched in very different terms, the analysis presented in this report points to a substantial overlap in the conceptual bases that underpin the approaches highlighted by the literature reviewed. To look at this more closely, the authors identified each of the various factors proposed in the reviewed literature and characterised the key features or key words associated with each. Using a content analysis approach, they clustered these on the basis of their apparent similarities. The authors' analysis of this material suggests that an organization's learning environment can be clustered around four areas: (1) Job structure; (2) Work process; (3) Social interaction; and (4) Managerial. Almost all of the factors identified in the report, they argue, fall into these four categories. The authors' working hypothesis that informs the next stage of this research is that organizational practices within RTOs (Registered Training Organisations) can better support learning at work when they focus on improving the characteristics of each of the job, work process, social interaction and managerial environments. In order to do this a first step for RTOs is to be able to identify how well they are doing in these environments. When RTOs have identified their current position, strategies can then be developed to strengthen the learning environment in each of the areas. This involves recognising the current characteristics that act as enablers and constraints impacting on the RTOs learning environment and then initiating organizational practices that encourage learning at work. Bibliography is provided. [This work has been produced on behalf of the Australian Government and state and territory governments with funding provided through the Australian Department of Education, Employment and Workplace Relations. For the full report, see ED503392. For an additional Support Document, "Investigating Learning through Work: Learning Environment Scale & User Guide to the Provider. Support Document," see ED503390.]