 NIDM is the new imaging data model. It's a project that started within the new imaging data sharing task force at INCF a while back. And it's a project that aims to describe derived data from analysis packages, so SPM, FSL, AFNI, and others, such that you have the full provenance of what has been done to the data within that model. So those packages will be writing files that describe exactly what has been processed using those data. So it's a very interesting and very ambitious project stemming from INCF.