Has been 30 years of work on individuals and how we sometimes make mistakes so we might make investment errors and we might make errors in our choice of consumer products. We might make errors in what we are scared about what we are not scared of. Theres also been a burgeoning bit of research that hasnt been pulled together on how groups either aggravate or reduce the problems of individuals. That actually is a huge improvement over the idea of groupthink which is kind have been a popular conscious now. Groupthink means that groups often suppress the individual ideas and creativity of their members and that is a real problem. But to figure out what actually lies behind groupthink, what are the specifics that make it happen, thats something where we really have made a lot of progress in the last decades in the book tries to figure out for ways that groupthink so to speak happens in firms and families and governments and religious organizations and labor unions and student organizations