A choice set is one scenario, also known as a treatment, provided for evaluation by respondents in a choice experiment. Responses are collected and used to create a choice model. Respondents are usually provided with a series of differing choice sets for evaluation. The choice set is generated from an experimental design and usually involves two or more alternatives being presented together. A choice set is one scenario, also known as a treatment, provided for evaluation by respondents in a choice experiment. Responses are collected and used to create a choice model. Respondents are usually provided with a series of differing choice sets for evaluation. The choice set is generated from an experimental design and usually involves two or more alternatives being presented together. The respondent is asked a choice task. Usually this is which of the alternatives they prefer. In this example, the Choice task is 'forced'. An 'unforced' choice would allow the respondents to also select 'Neither'.The choice task is used as the dependent variable in the resulting choice model.