We present a multi-level model of contextual factors that may influence teachers' assessment practices, and use this model in a selected review of existing literature on teachers' assessment knowledge, views and conceptions with respect to these contextual factors. Adapting Kozma's model, we distinguish three levels of influence on teachers' practices: micro, meso and macro. We searched for relevant articles in EBSCO, JSTOR and other databases, and review selected articles with a focus on the complex relationships within and across these levels. Findings reveal a large body of research at the micro-level (teacher), such as on teachers' values, conceptions and knowledge. However, there is relatively less research at the meso-level (school) or connecting it with the micro- or macro-levels. Implications for future research are also discussed.