A fundamental property of a question is the question type. The question type specifies how a question can or must be answered. In addition, the question type has an effect on whether a question can be assigned to an option set or to answer options.
The following question types are available:
The single choice question type specifies that the interviewee can select only one of the available answer options. As soon as this question type was selected the question must be assigned to either an option set or answer options.
The multiple choice question type specifies that the interviewee can select any number of available answer options. As soon as this question type was selected the question must be assigned to either an option set or answer options.
The text question type specifies that an interviewee can enter any text as an answer to the question.
The numerical (integer) question type specifies that an interviewee must enter an integer as an answer to the question.
The numerical (floating point number) question type specifies that an interviewee must enter a floating point number as an answer to the question.
The date question type specifies that an interviewee must enter a date as an answer to the question.
The date range question type specifies that an interviewee must enter a date range (from ...to ...) as an answer to the question.
The question types mentioned are mutually exclusive. Thus, a question can only have one question type.