Question Type: Select all that apply

[lukas-shawford]

Create a new question type for "select all that apply" questions. For example:

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Which of the following English monarchs were part of the House of Tudor? Select all that apply:

• [ ] Charles II
• [ ] Henry VI
• [x] Henry VIII
• [x] Edward VI
• [ ] James I
• [x] Elizabeth I

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To be decided:

• Scoring: should this be all or nothing, or should partial credit be given if user identifies some but not all of the correct choices? What if they select all of the correct choices, but also include one extra (incorrect) choice?
• Should this be its own question type, or just a variant of multiple choice? We could add a setting within the multiple choice question editor for "single select" vs "multiple select", where single select would be an ordinary multiple choice question (only one choice is correct), whereas multiple select would be the "select all that apply" type of question.
• When displaying this type of question, should we always prepend the list of choices with a "Select all that apply" label, or make this optional? Maybe automatically include it in the question editor textbox when this question type is initially selected, but allow the user to edit/delete it?