Creating a question requesting a value and a unit
Problem
You want to ask a respondent for a number which could be expressed in different units.
Solution
Discussion
Questions like this are called "unit-type questions". They have two components: an open-end numeric value and a single-choice series of units. For example, asking for the distance between home and work could be a unit-type question: the open-end numeric value is the number of units of distance and the single-choice series refers to the unit of measurement such as kilometers and miles. From CallWeb's standpoint, what is particular to unit-type questions is that the open-end part should not correspond to a particular unit choice and that the selection of a unit which is not the same code as the open-end must be permissible.
When a code corresponding to an open-end part has an N behaviour code, CallWeb expects that an answer other than that code will be selected by the respondent.