Partial Point answer scoring explained

Created by Boris Chekaev, Modified on Tue, 20 Sep 2022 at 10:10 AM by Boyko Cholakov

You can configure a checkbox problem to award partial credit to learners who submit an answer that is partly correct. You must use the advanced editor to configure it. Partial credit can be configured on the following problem types:



There are 3 ways to award partial points to learners:


  1. Award partial credit for Checkbox problem using EDC (Every Decision Counts) method. Using this method selecting both wrong and correct answers contributes to the total score of the problem. 
    In the example below the checkbox problem has 4 answer options. 3 of them are correct and 1 is incorrect. 
    Correct answers: A, B, D.
    Incorrect answers: C
    See table for reference:


    To configure a checkbox problem using EDC method follow these steps:


    1. Add new checkbox problem.
    2. Click on "Edit" button and use the Advanced Editor
    3. Add partial_credit="EDC" attribute to the "choiceresponse" element.

  2. Award partial credit for Checkbox problem using the "By Halves" method. This method requires the number of total answers to be more than double the number of wrong answers (e.g. If a question has 2 wrong answers, the same is required to have at least 5 total answers). The mechanism of this method is as follows: If a learner gets a wrong answer (either not selecting a correct answer or choosing a wrong answer) half of the remaining points are deducted from his score. See the table below for reference:

    mceclip0.png

    To configure a checkbox problem using the "by halves" method follow these steps:


    1. Add a new checkbox problem.
    2. Click on the "Edit" button and use the Advanced Editor
    3. Add partial_credit="halves" attribute to the "choiceresponse" element.


  3. Award partial credit using a Multiple choice problem. This method is different from the previous two as it awards partial points from the total score for selecting a wrong or partially correct answer. By default, it gives 50% of the total points for the selected answer. However, this amount can be configured for the chosen partially correct answer.

    A Multiple choice problem allows a learner to choose only 1 answer. In this way, a learner can get 100% of the points for choosing the correct answer, 0% of the points for choosing a wrong answer, or the % configured for the partially correct answer. See example below

    1) Choosing the correct answer awards 1 out of 1 points.

    2) Choosing the wrong answer awards 0 out of 1 points.


    3) Choosing a partially correct answer awards configured percentage of the points (25% in this case) 0.25 out of 1 points.


    To configure a Multiple choice problem to award partial credit follow these steps:
    1. Add a new Multiple Choice problem
    2. Click on the "Edit" button and use the Advanced Editor
    3. Add partial_credit="points" attribute to the "multiplechoiceresponse" element and change the "correct" attribute of the answer to "partial".
    4. Optionally you can add "point_value" attribute to the "choice" element. The "choice" element represents an answer to the question. By adding the "point_value" attribute you can specify what percent of the total points will be awarded for this answer.

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