Do you know this inner debate when you’re facilitating and somebody keeps monologuing: “Is this still relevant? Should I stop him? Do the others look bored? I should cut him off …”
That makes me judge and jury about whether something is still relevant to the whole group. I don’t like to make that call. If you’ve got a team (or team member) that’s prone to rambling you can make the team facilitate themselves with Jeff Patton’s Cups (Jeff himself credits “Katrina”):
Write “Tangent” on several styrofoam cups and distribute them around the table. Whenever someone verbally wanders off one of the other team members can signal it unintrusively by raising one of the cups. Upon the signal ramblers usually cut themselves off and the team can decide whether to park the topic for later.
Other possible cups are “Sold” for people still arguing when they’ve already convinced everyone, “Too much detail”, “No solving” when you’re still trying to frame the problem, and so on.
Keep cups and pens ready. Whatever the team is struggling with, approriate signal cups will evolve.
Obviously the signal doesn’t have to be cups. Paper would also do it. But cups stand out more (figuratively and literally) and are a great visual reminder that each team member can help keep the discussion going.
PS: For something more specific and even more playful check out the Rathole technique by Sandy Mamoli.