A Radio Button question is a question where multiple options are provided, but only one can be selected by the end user.

The following is an example of a Radio Button question:

What is your favorite color? Red
Blue
Green
Orange
Yellow
Other 

The following fields are specific to this question type and give you additional control over the display and behavior of this field:

List Options

1. List
 
If there are existing lists that administrators have added to the Web Forms tool, you may choose them from the drop-down list. These lists are reusable across any form. If the administrator makes any changes to the list, the changes will automatically be applied to any forms that use the list.

Note: Only administrators can manage global lists. For more information about global lists, see this help file.

Note: If the administrator has enabled Web Form Linking, you will have an additional list option called Link Web Form that allows you to use the responses of a Web Form as the list items for your question. For more information, see the Form Linking help file.

If you want to add your own list to the question, choose "Custom" from the drop-down list. The form will reload and display a text area where you can enter your list items, one per line. When finished, click the Add button, after which the form will be reloaded again. Now you can choose a default (if desired), as well as define an "Other" field. This is a field where if the user chooses the radio selection, there will also be a small single-line text field where they can type in their response. The example above has an "Other" field.

Note: "Other" fields can only be defined in custom lists at the question level. Although global lists can have "Other" fields, it is up to the administrator to define the field explicitly in the global list.

2. Defaults
 
You can choose a single item that will be selected by default when the form is first displayed to the user (that the user can then change on his or her own).

When updating a question, there is a checkbox that allows you to set the selected default for all responses to the form that do not yet have a value for this question. Note that once the value has been set for questions that did not previously have a value, the process is not reversible.

3. Columns
 
This defines how many radio items will appear on a single line before breaking to a new line. For example, if there are ten options and you choose three columns, you will have three rows with three options each, and the last line will have one option.
4. Maximum Responses
 
If the value of this field is one or more, then out of the total responses added to the form, only this many will be able to choose any individual option. If the maximum has already been met for a specific option and the user chooses that option, an error message will be shown informing them that they will need to change their selection.