That is interesting, before I red Dr. Simons comment I also thought it was needed as a lot of the things in the deism control seem to be standard steps in device development. In terms of which one is better I also think that the continuity of a DHF makes more sense instead of the snapshot. Snapshots do not tell the whole story and can be misleading. Having information on the device throughout its life cycle helps to tell a story and this is handy when troubleshooting or years later if you need to find some type of documentation