Abstract
In this paper, the probability content in senior secondary mathematics Victorian curriculum between 1978 and 2016 was classified and compared, by content, context, procedural complexity, the SOLO thinking frameworks and use of technology. While probability continues to form an important and increasing component of the curriculum, it has moved from the popular general mathematics to the specialised subjects. The senior secondary probability curriculum as described by the textbooks, provided students with a variety of levels of complexity and thinking in both 1978 and 2016, although low complexity questions were more common in 2016.