The subject of the influence of a coach’s decisions on match outcomes is now a talking point in coaching circles. That wasn’t always the case in the past. For many years the assumption was that coaching interventions (timeouts, subs, etc.) without doubt influence outcomes. This is the coaching mythology now challenged by the research.
Examples of this come from Mark Lebedew. He did a basic study based on the question of whether timeouts in any way influence the likelihood of the server missing their serve. In other words, are servers more likely to miss after a timeout. This is believed by many coaches. Confirmation bias is likely a factor here, though.
A while back Mark also wrote about some research into whether timeouts impact the next point. That piece was was based on some findings from basketball which suggest they are actually counterproductive. Not content to stop there, Mark followed up with additional posts here, here, here, here, here, and here. A researcher in a presentation at the 2016 AVCA convention also took on the subject of timeout effectiveness.
This research is definitely a good start. That’s all it is for the moment, though. I’d like to go down some other research paths with respect to volleyball. What do you think? What question(s) do you have?