Five experiments were conducted to assess egocentric biases in the availability of information in memory and attributions of responsibility for group interactions. The studies examined naturally occurring groups, married couples, basketball teams, and laboratory-assembled groups. Results consistently showed that individuals recalled their own contributions more readily and accepted more responsibility for group outcomes than others attributed to them. When group performance was negative, the availability bias was reduced but not eliminated. Selective retrieval of information also influenced responsibility allocation, with individuals assigning more responsibility to coparticipants when their contributions were more accessible. The egocentric bias in availability is thought to arise from selective encoding and storage, differential retrieval, informational disparities, and motivational influences. Self-generated information is more likely to be retained due to rehearsal, cognitive schema fitting, and self-esteem enhancement. Differential retrieval leads individuals to focus on their own contributions when estimating responsibility. Informational disparities mean individuals have more access to their own internal states, and motivational factors like self-esteem can enhance the availability of self-generated inputs. Experiments with married couples, basketball players, and problem-solving groups revealed egocentric biases in both availability and responsibility attribution. In Experiment 2, subjects recalled more of their own statements after success than after failure, and in Experiment 3, basketball players attributed more responsibility to their own team than to the opposing team. Experiment 4 showed that focusing on one's own contributions increased self-attribution of responsibility, while focusing on a partner's contributions increased partner-attribution. Experiment 5 demonstrated that questions about one's own contributions led to higher self-attribution of responsibility, while questions about a supervisor's contributions led to higher supervisor-attribution. The findings suggest that egocentric biases in availability and attribution are pervasive and influenced by factors such as self-esteem, selective retrieval, and motivational influences. These biases may be more apparent in situations where responsibility is explicitly assigned, but are less noticeable in everyday interactions where responsibility is not formally attributed. The studies highlight the importance of understanding these biases in group settings and their potential impact on interpersonal relationships and decision-making.Five experiments were conducted to assess egocentric biases in the availability of information in memory and attributions of responsibility for group interactions. The studies examined naturally occurring groups, married couples, basketball teams, and laboratory-assembled groups. Results consistently showed that individuals recalled their own contributions more readily and accepted more responsibility for group outcomes than others attributed to them. When group performance was negative, the availability bias was reduced but not eliminated. Selective retrieval of information also influenced responsibility allocation, with individuals assigning more responsibility to coparticipants when their contributions were more accessible. The egocentric bias in availability is thought to arise from selective encoding and storage, differential retrieval, informational disparities, and motivational influences. Self-generated information is more likely to be retained due to rehearsal, cognitive schema fitting, and self-esteem enhancement. Differential retrieval leads individuals to focus on their own contributions when estimating responsibility. Informational disparities mean individuals have more access to their own internal states, and motivational factors like self-esteem can enhance the availability of self-generated inputs. Experiments with married couples, basketball players, and problem-solving groups revealed egocentric biases in both availability and responsibility attribution. In Experiment 2, subjects recalled more of their own statements after success than after failure, and in Experiment 3, basketball players attributed more responsibility to their own team than to the opposing team. Experiment 4 showed that focusing on one's own contributions increased self-attribution of responsibility, while focusing on a partner's contributions increased partner-attribution. Experiment 5 demonstrated that questions about one's own contributions led to higher self-attribution of responsibility, while questions about a supervisor's contributions led to higher supervisor-attribution. The findings suggest that egocentric biases in availability and attribution are pervasive and influenced by factors such as self-esteem, selective retrieval, and motivational influences. These biases may be more apparent in situations where responsibility is explicitly assigned, but are less noticeable in everyday interactions where responsibility is not formally attributed. The studies highlight the importance of understanding these biases in group settings and their potential impact on interpersonal relationships and decision-making.