There are other tools in the category I'd like for Compendium to be considered in. I don't think its category is argument mapping or concept mapping, although those are certainly applications for it. It's more of a creative software, like PhotoShop, GarageBand, Windows MovieMaker, Camtasia, iMovie, FinalCut, even PowerPoint or Word. None of those packages are about creating certain kinds of outcomes, unless you define the artifacts you can make with them as the outcomes. Similarly none of them promise (if they're honest) that just by virtue of using the tool you'll be able to produce a well-crafted artifact. What they do promise is that they'll provide the resources you need to hitch to your own creativity, skill, and knowledge, and that they will let you do things that expand your reach. If you know what you want to express and how you want to express it, these tools will help get you there and do it with the speed, quality, depth and density of pallette you need.
And by the way, this is the transliteration of Compendium in Hindi: कोम्पेंदियम