I am testing CDD with my students, typical healthcare professionals and undergraduate, and they are destroying the CDD sheets with the RM packages' classes: only in 2 days of 2 hours each, they were able to delete classes and attributes, misplace classes and attributes, change classes and attribute names, even under my strict supervision. I show them that XMind is super-delicate and that everything they should do is lightly single-click on the classes, press CTRL+C, go back to the CCD sheet, lightly single-click on the classes or attibutes to be modelled/constrained, and then press CTRL+V. And I show them over and over again how to do that on my own computer, projected on the infolab's screen.
That means that CDD, the way it is now, is only for conaisseurs and very skilled computer users, not common mortals. The only way I devise to solve this problem is "freezing" the RM package sheets by making them read-only or something similar, I mean, something that, no matter how many times somebody clicks on the wrong place, it won't move, it won't allow any changes, it will only allow pasting.
I will submit this to the XMind team. It already exists as a feature request for them but I do not know what action they are taking on it. We may need to create a CDD from the existing XMind code???