Studies commissioned by Lifespring in the 1980s by researchers at Berkeley, Stanford, and UCSF, including Lee Ross, Morton Lieberman, and Irvin Yalom, found that an overwhelming majority of participants in this training called it either "extremely valuable" or "valuable" (around 90%).
Groups and trainings such as Lifespring, Erhard Seminars Training, IMPACT Trainings, The Forum, Newfield Consulting, Seres Naturales, Landmark Education and Benchmark claimed to have worked to improve people's overall level of satisfaction and interpersonal relations through group interaction.