So I have a situation here I would like some advice on, so apologies if this is long. During planning, our team chooses who will work on what, they volunteer to do the work, story by story. We have 3 that do testing, and one of them never volunteers for anything. We always have to drag her into participating each and every planning session. After a couple sessions, I have overheard the other two testers grumbling about how this other person never volunteers and then also overinflates her estimates on how long it will take to do the work. I’m not sure how to approach this situation, but its clearly becoming a problem with at least 1/2 of the team. What would you suggest the first step would be? I don’t know if this is a retrospective topic where I ask if the team if the volunteer approach for each story is working for them? Or if I should a different approach and have a conversation with the non volunteer team member?