Artifacts might not be the right framing for collective output
My hypothesis that Collective artifacts structure collaborative learning and engagement might not be entirely accurate. In my Learning Groups I have realized that it is difficult to "create" together because we each have divergent goals of learning.
Also the idea of an "artifact" gives the sense that the output must be perfectly polished, while really my goal is not the final outcome but the process that it takes to get there. For a typical learning group with divergent goals, you should focus instead on providing the space (information and material) and verbs (processes and interactions) to create an Enabling environment for people to work towards more polished output and ideas.