ViewPoint was CliffordAdams' initial (circa 2000) vision for a wiki supportive of multiple points of view, perspectives, etc. In 2005 CostinCozianu independently re-invented the idea as WikiChangeProposal. For more details, see the SisterSite page on MeatballWiki.
If indeed the differences are insufficient to make or break the acceptance of the concept by end users, then I would like to hear Clifford's comments on his and Costin's model of wiki. But since Costin is close to having a real product, that additional effort does merit a serious consideration by people interested in setting up wiki communities. -- DavidLiuCategoryWikiImplementation