Meetings often dominate software projects. Despite frequent dissatisfaction within meetings, many software engineers are not aware of the crucial importance about their behavior. This can set the tone for the entire project and influence the success. In a study based on 32 student development teams with 155 participants, we observed the participants' interactions during the first internal team meeting. Analyzing the observations showed that constructive remarks had a positive impact on positive group affect tone. However, this effect can only be observed when supportive utterances followed constructive remarks. In the article, we show a complete mediation of this statistically significant effect, e.g., about seemingly subtle interaction patterns that influence group affect tone. We also propose practical interventions on how software projects could benefit from supportive meeting behavior. This summary refers to the article "Positive affect through interactions in meetings: The role of proactive and supportive statements" [Scl8] published in the Journal of Systems & Software in 2018 (vol. 143). © 2019 Gesellschaft fur Informatik (GI). All rights reserved.