In question-and-answer format, the author discusses what information project managers in charge of disinfection byproduct (DBP) studies need to know when deciding what disinfection byproducts should be measured, how the samples should be collected, and who should do the analyses. The article answers the following questions: What analyses should be included in a DBP study? What methods are available for measuring DBPs? How long does it take a lab to learn new DBP methods? Are there special sampling considerations? How much time does it take to analyze samples? and What else should be done to ensure quality data? Tables give information on analytical methods used for various types of DBPs, laboratory time required to become proficient with DBP methods for various analytes, and dechlorinating agents and preservatives and sample holding times generally used in DBP studies.