A consistent framework for reservoir characterisation from the pore scale through to the reservoir simulation scale is presented. Concepts that clarify the characterisation problem are explained and the scales that are of most importance to applied reservoir characterisation are defined. Workflows are presented illustrating how both static and dynamic petrophysical properties may be moved from one scale to the next, and how the similarities and the differences in the procedures at each scale change are considered. Why a multi-scale approach involves more steps than just upscaling, as is often traditionally assumed, is explained and illustrations are given at various scales of what a comprehensive multi-scale approach entails. How the concept of model-prototype similitude can be used to overcome limitations in the characterisation workflow is introduced and then the details of its use to transfer saturation-dependent petrophysical properties to coarser scales are explained.