Cohesiveness could be best described as bonding, or uniting (ex. family friends). I would say that cohesiveness impacts our behavior in a good way, it makes us want to form bonds with people around us either at school, work, church, family etc. which is very important for our social skills, it makes us frienlier, easir to approach, and more involved in whatever we are doing. I think cohesiveness its important when trying to be successful, wether at improving our grades, with group studes, having good family relationships, or in helping us get a raise or get promoted because one is one gets along with eveybody at work. But thats just my opinion, I hope I helped.