Final answer:
The survey method is used to progressively collect information from a group of anonymous respondents.
Step-by-step explanation:
The technique that progressively collects information from a group of anonymous respondents is the survey method. Surveys involve asking individuals a series of questions about their behaviors and opinions, often in the form of a questionnaire. This method allows for a large amount of information to be collected from a diverse group of people in a relatively short amount of time.