Scrumboard interactive planning
How to benefit from the interpersonal mechanism that Scrum requires
A good sprint starts by a good Sprint planning. It is easier with a Sprint Wizard that helps.
Yes,
it is difficult to setup an environment where everyone has a chance to speak freely: the shy, the young, the expert, the one on the phone, the grumpy ...
Yes,
a large part of Scrum benefits comes from the level of collaboration in the self-organized teams, the so-called collective intelligence.
So how to cope with this?
Let's start by implementing properly Scrum Sprint planning by using interactive sprint planning wizard

How does it work?
1 Launch a sprint creation
Only after closing the previous sprint by running a sprint demo
2 Run the planning ceremony
Discuss PBIs, debate on solution etc
3 Connect (soon available)
The members of the team are automatically invited to the ceremony when it starts. They can join easily, typically from their phone or laptop
4 Vote (soon available)
When analyzing a story, the runner of the ceremony can call for a vote on what participants believe is an accurate sizing. When all votes are cast, a summary of the vote is displayed with the average and standard deviation. All the team needs to further dig or to confirm the sizing.