CBM Grade Summary
Basic documentation on Certainty-Based Marking (CBM) is at https://docs.moodle.org/en/Using_certainty-based_marking .
This plugin displays result reports (for teachers) that properly summarise student performance in quiz attempts that use CBM behaviour. Optionally, scores on individual questions can be displayed. Percentages can be calculated on the basis of either just those questions for which a student has entered a response, or the whole quiz. For example, 100% correct on half of the questions - those which the student has chosen to work on - can be shown as 100% rather than 50% correct. This is appropriate when a student uses the quiz for self-testing, choosing just questions relevant to current learning or self-assessment needs.
The plugin was developed alongside improvements in CBM behaviour that are included in core code in Moodle 2.6+. Version 1.2 can be used with Moodle 2.3-2.6. Version 2.7.02 is required for Moodle 2.7 onwards (at least to Moodle 3.0). It really should be in core Moodle.
This plugin doesn't affect feedback of information to students. CBM feedback in student Reviews was introduced in core Moodle 2.6, though this is much improved by installing patches (including for earlier versions 1.9+) available at http://tmedwin.net/cbm .
If you want Moodle Grades to correspond to CB Accuracy (0-100%) for comparison with conventional accuracy rather than to the total of CBM marks (see https://docs.moodle.org/en/Using_certainty-based_marking ) then use the code modifications and plugin available at http://tmedwin.net/cbm . Otherwise Moodle Grades range up to 300% based simply on the total CBM marks and have a non-linear relation to conventional accuracy, .
Please report any issues to me: Tony Gardner-Medwin (a.gardner-medwin@ucl.ac.uk)
Useful links
Screenshots
I used to use the "plus" version of your plugin, but since I upgraded to Moodle 2.9 I cannot find a version that is compatible. Is this in development?
Many thanks, greatly appreciated.
Stella
"Exception - Call to undefined method quiz_attempt::fire_attempt_reviewed_event()
Coding error detected, it must be fixed by a programmer: Invalid state passed to moodle_page::set_state. We are in state 3 and state 3 was requested. "
I followed the instructions for setting up the calculation of CBM; http://tmedwin.net/cbm/moodle/download/
Other than overwrifgting the modified php files and uninstalling the plug-in how do I fix this?
,Thanks
I was asked to install this plugin on a moodle v3.5 site, and did so. I'm not a moodle expert in any way, but believe I should find the report under the Grades section when selecting a course. Is this assumption correct? If so, then I'm lost, because the report is nowhere to be found on the site.
Is it possible for you to explain where I could find the report?
Kind regards,
Riaan
Also, any idea if the code distributed at TMedwin.net compatible with 3.7, or will adjustments be needed?
Thank you for everything you have put into this. You've made moodle a better and more dynamic tool!
(2) The preferred (but more complex, non-linear) grading scheme (0-100%) unfortunately does still require patches to the core code. There have been no reported problems with these patches, but I would need help to get them incorporated into core. Anyone interested? An alternative for student selftests is to use my (non-Moodle) site for CBM selftests: https://tmedwin.net/cbm .
Though I certainly see the value in a 0%-300% scoring scale, the accuracy+bonus (0-100%) model is going to be an easier transition for many where I work. If there's ever anything I can do to help get the core patched to support both options at the user level, please let me know what I can do to help!
I am running it on 3.8--it's a little tricky to install since you have to change the Moodle core files and need some good admin / Linux skills, which I am no expert but with persistence I finally got it working!
If there is anyway to make the "plus" code a plugin, or even better make it a part of the Moodle core since CBM is already included in the core, then I think CBM will really take off and more teachers will be willing to try it with their students.
The feedback and CBM report students get is extremely helpful, and the "plus" code that scales the score based on accuracy and CB bonus is genius!
Was wondering if the CBM code could also be applied to the adaptive and interactive with multiple tries modes--that would be an extremely powerful 1-2 punch of formative assessment & reflection with real-time instructor delivered hints for the "teachable moment" when students make mistakes as part of the natural learning process!
I'm seeing students making much better observations and reflections on what they understand--thank you again Tony for sharing your brilliant work with the world!
Inserting the code mods should be simply a matter of copying all the new files in one operation onto the server, overwriting the standard ones. Backups of the original files are provided in case you want to go back. [I haven't ever used Linux!] But I would be really glad if someone could help get these mods into core Moodle code. I'm not familiar with the protocols, or the (new?) Moodle quiz modes you talk about, since I don't use Moodle myself.