They meet at the same time at the same place, like an appointment, at regular intervals to encourage this relationship-building. This can happen weekly, bi-weekly, monthly or yearly. Studies have shown that the more exposure a person has to another person, the faster the relationship gets built. Using this information, it would be fair to expect that relationships you built in a group that meets weekly grow stronger faster than those that only meet monthly. In a year's time, a weekly meeting would expose business professionals to each other 52 times while with a monthly meeting, there would be only 12 times.
Groups also vary in their composition.
Many groups are comprised of one business professional from any chosen field, thus eliminating competition within the group for specific business leads. Other groups place restrictions on length of time in business, or level of responsibility in the firm when deciding on the acceptance of specific members. Still others have no restrictions at all. Restrictions that are placed on the membership of a group often help ensure that the membership is comprised of business professionals who are all looking for the same thing. In other words, they are all playing by the same rules.