This bonding is hard to break and will help increase your retention rate. However you choose to welcome your new members it is important to include some form of group orientation program. Many groups skip this and begin by getting new members immediately involved in group projects. Although new member involvement is essential, it is equally important to orient them to your group's goals, objectives, organizational structure, rules and norms. This unifies the group and helps the members feel more comfortable with the group and understand its processes.
Proper orientation leads to better understanding, more commitment, and less frustration.
After you've successfully completed your recruitment and orientation for new members the group should have quality time to get to know one another. Don't forget your old members either, without them you wouldn't have had a group for your new members to join. Talk to all new members about their skills, interests and previous experiences. Once you have this information, it will be easy to get them involved in your group's projects. To be sure that their first organizational experience is a positive one, assign new members tasks that are well within their skill level and that they can successfully accomplish.