The story told here of the CLT’s origins and evolution will sort the model’s distinguishing characteristics into three clusters – ownership, organization, and operation – and then say how each of them came to be added to the definition and structure of the CLT over time. The reality was much messier, of course, with ideas and influences often leapfrogging the narrative boundaries between eras. History seldom unfolds as neatly in the living as it does in the telling.