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Interactive Voice <br />Business <br />50 <br />Business respondents <br />using stratified sampling <br />using a list of businesses <br />identified by the City of <br />Tukwila as having the <br />highest impact on <br />improving storm water <br />quality <br />Questionnaire <br />Research questions was developed by HR2 Research/Analytics with input from the <br />City of Tukwila storm water management leaders, Greg Villanueva and Ryan Larson. <br />The survey consists of up to 30 variables relating directly to knowledge about storm <br />water issues and practices respondents had adopted which protect the quality of storm <br />water. Additional questions address an overall assessment of surface water quality <br />and where illicit discharges should be reported. In the questionnaire development <br />process for 2017 it was determined that stewardship activities which Tukwila <br />residents have heard of or participated in within last year would be removed from the <br />2017 research. New content for the 2017 survey includes an assessment of citizens' <br />understanding of Low Impact Development (LID) techniques. <br />Statistical Weighting <br />Statistical weighting is a technique that is critical in longitudinal research. During the <br />process of data collection, demographic data from the U.S. Census is obtained to <br />provide a base for weighting each year. It is important to know that this was done for <br />the purpose of conducting longitudinal research and not to derive a favorable result. <br />Sample demographics—specifically, gender—are compared with distributions in the <br />population within the city. Using the same weighting methodology utilized for the <br />survey of 2011, 2012, 2013 and 2015, the collected data was ran through a statistical <br />procedure to determine that there is no significant difference between weighted and <br />un -weighted data. <br />Research Controls <br />HR2 Research/Analytics applied a variety of controls to help ensure that the research <br />and analysis reach the highest quality that can be provided. The primary research <br />controls employed in this study include the following: <br />Research Assistant Training <br />All interviewers participated in a special training session for this study. During this <br />training session, the questionnaire is read and a discussion is held regarding the <br />29 <br />