Generalisable means the findings can be reliably extrapolated from the study to a broader population of patients/service users and/or applied to settings or contexts other than those in which they were tested.
Transferable means the findings of a qualitative study can be assumed to be applicable to a similar context or setting. Most qualitative studies are not usually generalisable but can often be considered to be transferable.
This definition involves an attempt at generalisability or transferability, i.e. the project deliberately uses methods intended to achieve quantitative or qualitative findings that can be applied to settings or contexts other than those in which they were tested. The actual generalisability or transferability of some research findings may only become apparent once the project has been completed.