Open-ended scales are data collection instruments in which no predefined options or categories are included for participant selection. In such instances, participants supply their own responses to each open-ended scale item. Communication researchers often use open-ended scales as an initial data collection tool to learn more about participants’ experiences and opinions regarding a specific subject of study. This entry provides a definition of open-ended scales, discusses the benefits and challenges associated with this type of measurement, and provides examples of different types of open-ended scale items.