This study investigated the influence of the Iowa Association of School Administrators (ASA), the Iowa Association of School Boards (IASB), and the Iowa State Education Association (ISEA) in determining educational policy in the first session of the 70th Iowa General Assembly. Specific research questions asked how legislators' opinions of influence varied in regard to selected demographic characteristics of the legislators. The 100 representatives in the House and the 50 members of the Senate of the first session of the 70th General Assembly served as the population for the study. The sample consisted of 132 representatives and senators (88% of the House and 88% of the Senate). Data were collected by interviewing legislators during the first session. Interview questions asked the legislators to state their opinions about the influence of educational interest groups in determining educational policy. In addition, legislators were asked to compare the IASA, IASB, and ISEA in a number of areas including credibility, prestige, electoral influence in the home district, and overall influence in the legislature. A structured format was used for each interview. Each legislator heard the same questions verbatim, and responses were selected from those provided by the interviewer. Responses were analyzed by comparing the frequency of responses from demographically designated groups of legislators. A chi-square analysis was used to determine which demographic factors were related. In the opinions of the legislators in the sample, educational interest groups were one of the most important sources of influence in the legislature in matters of educational policy. The three groups in the study were not equal in influence in the opinions of the legislators, and the amounts of influence assigned to each organization varied according to the selected characteristics of the legislators. The political party, more than other legislator characteristics, accounted for differences in legislators' opinions. Other factors which accounted for differences were found to be highly correlated with political party. The ISEA was selected by legislators as most influential organization overall. The IASB was rated second. The IASA was considered least influential by the legislators.