What is a disadvantage of using open questionnaires?

Using open questionnaires has the disadvantage that they can be time-consuming to analyze due to the qualitative nature of the data they produce. Unlike closed questionnaires that yield quantifiable data (like multiple-choice questions), open questionnaires allow respondents to provide detailed, unstructured responses. This variety in answers means that researchers must carefully read and interpret each response to extract relevant insights, identify themes, and code the data effectively. This process can involve significant time and effort, as it often requires the researcher to sift through a vast amount of text, categorize information, and sometimes perform thematic analysis, all of which can slow down the overall research timeline.