Test Scoring Rules and Outcome Declarations
Test scores are determined by a student's performance in the various Items of a Test. Individual item scores can be tallied using different methods to produce the final test result. This chapter shows how to configure the test scoring rules, and compute the Outcome Declarations.
For information on the scoring rules used for items, see Item Scoring Rules.
Follow the steps below to set up your chosen scoring method.
1. After you have created your test by selecting the items which are to go in it, hover over the cog wheels just below the Action Bar, at the top of the right-hand corner of the Canvas, and you will see the option Manage Test Properties. Click on this and the general properties of the test will be displayed in the right-hand panel, including the properties for scoring.
2. Click on the button Scoring.
There are four methods for scoring a test, or "outcome processing" as this is called in QTI. Enter your choice from the four options below in Outcome Processing:
None: If this option is selected, any existing scoring rules will be removed. In this case, no test score will be generated. Scores for the individual items of the test can be extracted by clicking on Results, or the QTI Results API. Use this option if you do not need aggregated test scores, or want to do custom outcomes processing outside of TAO.
Custom: This option is only applicable when a test with custom outcome processing rules is imported - thus the processing rules are defined outside of TAO. In this case - for example if the assessment test XML is modified outside of TAO and imported back into the system - the rules cannot be authored in TAO, so the existing rules are left untouched.
Total Score. If you select this as your chosen method, all scores from all parts of the test will be added together, and outcome variables for the test-taker's score (SCORE_TOTAL), the maximum score of all items (SCORE_TOTAL_MAX) and the ratio of correct responses (SCORE_RATIO) will be generated.
- Cut Score: If you choose this option, a cut-off point for passing the test will be fixed. Enter the score which is to be used as the cut-off point in the Cut Score box. This is set as a ratio of the total score. A PASS variable is then generated, indicating if the student has passed the test. When "Category Score" is active (see below), PASS variables for all categories are generated, all using the same cut-off point.
If you choose either of the latter methods (Total Score or Cut Score), some additional information is required.
A check-box for Category Score will appear. If Category Score is selected, the scores will be calculated for each category separately. You will also need to set the Weight variable in the Weight box, which is used to calculate the score, and is by default 'WEIGHT'. Different weights can be assigned to different items of the test, based on how much they should contribute to the final test score. For example, if a weight of 2 is entered, the score for that item is multiplied by 2 when calculating the final test score (see section Item Scoring Rules for more information on weighting). If, for any item of the test, there is no such weight definition at the Item level, the scoring engine assumes the default value = 1.
When item metadata is inserted, it is automatically transferred to the categories of the item. Categories can also be managed manually.
3. Click on the button Outcome Declarations.
The Outcome Declarations are directly related to the scoring rules you have chosen above; the list of generated outcome variables is as follows:
If you selected None as the outcome processing method, all outcome variables are removed
If you selected Total score as the outcome processing method, outcome variables are generated to calculate total scores
If you selected Cut score, as the outcome processing method, outcome variables are generated to calculate total scores and variables which are checked against the cut-score which has been defined (typically pass/fail)
If a WEIGHT has been applied, additional outcome variables are generated to compute weighted scores
Note: Outcomes are generated automatically, but in the few cases where this does not occur, the values can be generated using the 'regenerate' button.
The configuration of the scoring rules is now complete.