This model believes that an individual may be free from physical disease or injury, but the social factors around them will determine their well-being. In the social dimension of health, a person must be able to interact with other people, such as friends and family. According to Antonia C. Lyons and Kerry Chamberlain (2006) Health Psychology a Critical introduction “studies have demonstrated an association between so-called social integration and physical health, including mortality rates.” The ability to establish healthy relationships can give an individual a positive self-image. Poor social skills can mean that an individual may become isolated or stressed. If a person becomes stressed and isolated, he will be free from illness because he will be physically and mentally fit, but stress will contribute to his health condition. According to Charles L. Sheridan and Sally A. Radmacher (1992), health psychology challenges the biomedical model: "attributes such as strength, health, and attractiveness may be useful in coping with