Players can help each other if they're trained in the skill - doing so provides an asset to the player being helped. Does multiple skilled players helping stack?
Say three characters are trained in identifying Numenera. What's the outcome? Player attempting the task reduces its difficulty by 1 through skill, and either gets 1 or 2 assets. Is there "too many cooks in the kitchen" so only one asset applies?
This answer to "Is there guidance on applying overlapping skills to reduce difficulty?" shares great general philosophy on combining assets, but it's not entirely clear what's the best outcome in this case.