1) The document introduces a conceptual model for understanding self-directed learning (SDL) in online environments. It reviews existing perspectives on SDL that focus on either the SDL process or personal attributes.
2) The model aims to address the lack of focus in prior models on how SDL functions within specific contexts like online learning. It describes SDL as a dynamic interaction between personal attributes, process, and context.
3) The paper reviews several prominent SDL models and then introduces the authors' own research-based conceptual model for SDL in online contexts, which considers how the online environment impacts SDL.