From Hardhats Listserve:

Here are some recurrent questions us nontechies have about VistA:

1) Is Mumps a serious limitation to complete EHR functionality, code maintainence, HL7, or PMS interfacing?

2) What is the fundamental difference between a relational database and a hierarchical database and how does that effect the end-user? (Should we even care? If so why?)

3) How hard is it for non-Mumps IT personnel to learn Mumps/VistA and are there enough experienced VistA programmers (or former VistA programmers) to consult or be hired to non-VA projects?

4) What other concerns should we have regarding adopting VistA?