The document summarizes Tuckman's stages of group development (forming, storming, norming, performing) and how changes can cause groups to revert to earlier stages. It then discusses Gottman's "Four Horsemen of the Apocalypse" relationship predictors (blaming, defensiveness, contempt, stonewalling) and how these can become "team toxins" in organizations. Specific behaviors are provided for each toxin along with potential neutralizers drawing from Scrum values like focus, openness, courage, respect, and commitment. Sources are listed at the end.