There are a few communication strategies that can be employed. If sending an email doesn't work, I usually direct message them. If that doesn't work, I put a meeting on that person's calendar. At that point, if there is extreme unresponsiveness, escalating to their manager is appropriate. For communicating with multiple team members, in my experience, the most effective method is to set up meetings to discuss topics that need the team's input and collaboration. Long email chains back and forth can get disorganized without resolving anything. It is more time efficient in that case to just meet for 30 minutes and have everyone in the room (could be virtual as well) and discuss what needs to be decided. This will decrease the chance for misunderstandings.

Before beginning a project as a team, it is important that the team delegates tasks and assigns responsibilities to each individual teammate based on his/her strengths. To establish early on what will be expected of each team member throughout the duration of the project with a detailed project schedule is key to avoid communication issues deeper into the project timeline. If someone in the team seems to be falling behind, it is important to partner with that teammate and communicate that you are willing to help clear up any possible confusion and possibly provide a minor extension on a deadline to allow the teammate to fully catch up.

I have noticed that with projects involving a larger number of teammates, having critical meetings in a virtual setting can be difficult, as many people may wish to speak a the same time. To maximize communication among many teammates, holding in-person meetings can be extremely beneficial. In a lot of cases, holding meetings in-person encourages members to speak more freely and add any questions/comments they have with less hesitation. This practice can be essential in ensuring effective communication.