According to the Bandura's Social Cognitive Theory of Self-Efficacy, the beliefs a person holds regarding his or her power to influence situations strongly affects the agency a person has to face challenges capably. A tool such as an up-to-date MWC that has a list of the medications and dosages in addition to medical conditions listed may help older patients to better understand and manage their health. Furthermore, a wallet card has been an effective tool with many benefits. For example, a study showed that a Medication Allergy Profile card increased patient's knowledge of their drug regimens, decreased medication errors, decreased drug interactions, and improved patients' compliance.