What type of field is best for coding multiple choice values?

The most suitable field for coding multiple choice values is a Check Box List. This format allows users to select more than one option from a set of choices, which is essential for scenarios where multiple answers are permissible. Unlike radio buttons, which only allow one selection from a group, check boxes facilitate the selection of multiple values, reflecting the "multiple choice" nature of the question.

A drop-down list, while it can show multiple choices, typically restricts the user to selecting only one option at a time, making it less ideal for multiple selections. Text areas allow for free-text input, which does not align with the structured nature of multiple choice questions where predetermined responses are required.

Thus, a Check Box List is the most effective approach for capturing multiple choices, as it directly supports selection of several alternatives in one simple, user-friendly format.