The link between initial data and the conclusions one can draw from them will be probabilistic (sometimes with probabilities 0 or 1, hence deterministic). One might be concerned that the flexibility in framework choice provided by R1 and R2 could lead to different results when using different frameworks. However, it is straightforward to show, see Ch. 16 of Griffiths (2002a), that as long as both frameworks contain all the events needed to express the initial data and also those needed for drawing conclusions, the probabilities linking data and conclusions will be identical even if the two frameworks in question are mutually incompatible. This ensures an overall consistency. The discussion of quantum preparation and measurement found in  section 7 below will show how principles of quantum reasoning apply to measurements, a topic that has given rise to a lot of confusion.