The purpose of this study was two-fold: to identify role functions and characteristics perceived as important to Advanced Nurse Practitioners (ANPs) in Texas, and to identify differences in perceived importance of role functions and characteristics of ANPs according to gender, educational preparation, practice setting, and whether the practitioner entered practice before or after the current rules and regulations for ANP practice were adopted. Two questionnaires and a demographic data form were mailed to 300 ANPs in primary health care in Texas, with 152 responding. Data from the questionnaire, "Characteristics of the Advanced Nurse Practitioner," were analyzed using independent group t-tests. The findings indicated that the characteristics "person-oriented," "perceptive," and "skilled in problem-solving" were the most valued by the practitioners, while aggressive" was the least valued. Independent group t-tests were used to analyze data from the instrument, "Advanced Nurse Practitioner Functions." The results of this analysis were not significant. The Chi square test was used to further examine data from this questionnaire to determine if the responses differed from chance. With the exception of four items, all of the responses differed significantly from chance. The responses "extremely important or important" were selected significantly more frequently that any of the other options. Not appropriate," was selected significantly more often than could be expected by chance for two functions: suturing minor lacerations and performing incision and drainage of wounds. Fourteen functions were examined further using frequency, percentage of responses, and the Chi square test to determine if there were differences in responses between groups. There were significant differences in responses between ANPs in nurse-managed settings and those in physician-managed settings on four functions: ordering diagnostic tests, prescribing medications in consultation with a physician, suturing minor lacerations, and performing incision and drainage of wounds. Practice setting and educational preparation were the variables which had the greatest impact on perceived importance of the characteristics and functions to ANP practice.