Developing mathematical connections for pupils continues to be at the forefront of educational policies worldwide. One strategy suggested to support the connections pupils make is the idea of developing "coherence". Research regarding coherence has increased within mathematics education, however, the term is used widely. It therefore becomes necessary for coherence to be further conceptualised. In this systematic scoping review, five databases were searched for literature on the topic of coherence in school-based mathematics education. A total of 11,587 pieces of literature were extracted. Following further screening, 35 papers were reviewed. The findings suggest that there is limited consensus regarding the conceptualisation of coherence, leading to fragmented perceptions across the literature. This paper presents a framework for coherence based on the TIMSS curriculum model to support international comparisons of coherence and provide clarity for mathematics education researchers and school colleagues when considering which aspect of coherence they are addressing.