Health care providers use Predictor Systems to uncover why different segments of the population prefer various services offered by one HMO, and not another. For health care executives explaining why customers use similar services offered by competitors or the conditions under which people will use one type of service and will switch to home providers is a key strategic advantage that can be integrated to any marketing campaign to influence consumer preference. It can drastically decrease the cost needed in profiling potential members as to their specific needs and preferences.