Image Hotspot

Description

Allow students to indicate, by clicking with the mouse, particular areas of an image.

Rationale

This question type is good at eliciting 'where' knowledge. For example, in a question showing a car the student could be asked to click on a wheel. This is fundamentally asking the question 'where is the wheel'. Contrast this with the Labelling question type which asks 'what' knowledge.

Fit Criterion

Presentation

• Image types supported include: GIF, PNG and JPEG.

Staff Editing

• Between 1 and 10 points of interest (sub-questions) can be set.
• Each sub-question can have multiple correct answer zones. So, for example, click on an eye would allow a student to click on the right or left eye.
• Correct answer shapes to be made up of:
  • Ellipses
  • Rectangles
  • Irregular multi-point polygons
• Eraser to delete unwanted correct answer areas
• Ability to move a correct area in any direction

Student Answering

• When student clicks the question automatically advances to the next part (sub-question)
• Students can change their answers to an sub-question any number of times

Marking

Two basic marking methods are possible:

In either marking method academic staff should be able to specify the number of marks to award if correct and the number (possibly negative) if wrong. Marks correct should range from 1 to 20 and marks incorrect from 0 to -10 with the addition of -0.25 and -0.5.

Feedback

Feedback includes:

• Location of student answer.
• Display all correct answer zones.
• Student mark out of possible number.
• Textual feedback is available for each option (different feedback can be written if the student gets it right as opposed to wrong)
• If standard setting has been used this should be displayed
• List of learning objectives that the question is linked to

Limited Save

After a question has locked it should only be possible to change the following aspects:

• The correct answer zones.
• Number of marks available.
• Status - only 'Normal' or 'Retired' (not 'Incomplete', 'Experimental' or 'Beta')
• Bloom's Taxonomy
• Keywords
• Teams

Standard Setting

• When 'Mark per Option' is used it should be possible to rate each sub-question.
• When 'Mark per Question' is used there is only one rating per question.

Data Format

Correct Answer

The correct answer is stored in the 'correct' field in the options table. The format is thus:

1. | characters separate all the sub-parts (tabs) of the question
2. Next split on the tilde ~ character:
   1. Text of the question
   2. Colour of the tab (decimal)
   3. Type of shape (e.g. polygon, ellipse, rectangle)
   4. X/Y coordinate points (comma separated in hexadecimal format)
   5. ID of the shape starting at zero.

Note: Multiple shapes can be used on a single tab.

Student Answer

Student answers are stored in the 'user_answer' field within the relevant log table. All sub-parts of a question are stored together, separated by | characters. Within each sub-part there are three sections separated by commas:

1. Is the sub-part right or wrong (1 = correct, 0 = incorrect)
2. X-coordinate of student click point
3. Y-coordinate of student click point

A completely unanswered question stores its answer as 'u' for unanswered. However, if parts of a question are answered and some not, then the ones that are not answered will be stored as:

|0,false,false