Creating and grading exercises are recurring tasks within higher education. When these exercises are based on diagrams - like logic circuits, automata or class diagrams - we can represent them as models, and use model-driven engineering techniques for the large-scale generation of quizzes, which can be automatically graded. In this research demo, we showcase Wodel-Edu, a domain-independent tool for the generation and automated evaluation of diagram-based exercises. Wodel-Edu is built atop Wodel, an extensible tool for model mutation, and offers seven kinds of diagram exercises. It supports code generation from the exercises for the Moodle platform, the web, Android and iOS applications.

1. www.uam.es
Wodel-Edu: A tool
for the generation and evaluation
of diagram-based exercises
Pablo Gómez-Abajo, Esther Guerra and Juan de Lara
Universidad Autónoma de Madrid, Madrid, Spain
October 2023

2. www.uam.es
Motivation
• There is a lack of frameworks to generate domain-
independent exercises
• There is a need to generate a high number of exercises
• An assistance tool of this kind would alleviate much of the
professors’ work
• Extension of the Wodel tool for model mutation to generate
and evaluate diagram-based exercises for any domain
2/13
Proposed solution

3. www.uam.es
Motivation
• There is a lack of frameworks to generate domain-
independent exercises
• There is a need to generate a high number of exercises
• An assistance tool of this kind would alleviate much of the
professors’ work
• Extension of the Wodel tool for model mutation to generate
and evaluate diagram-based exercises for any domain
2/13
Proposed solution
Wodel-Edu

4. www.uam.es
Overview
3/13

5. www.uam.es
Def.
concrete
syntax
Create MM
Generation and evaluation of
exercises with Wodel-Edu
4/13
Automatic
generation
Exercises
solving
Automated
grading
Def.
mutation
operators
Textual
represent.
Exercises
description

6. www.uam.es
Create MM
5/13
Load or create the domain meta-model
Generation and evaluation of
exercises with Wodel-Edu (1/8)

7. www.uam.es
Def.
concrete
syntax
Create MM
6/13
Define the graphical concrete syntax by means of the
modelDraw DSL
Generation and evaluation of
exercises with Wodel-Edu (2/8)

8. www.uam.es
Def.
concrete
syntax
Create MM
7/13
Def.
mutation
operators
Define the mutation operators by means of the Wodel DSL
Generation and evaluation of
exercises with Wodel-Edu (3/8)

9. www.uam.es
Def.
concrete
syntax
Create MM
8/13
Def.
mutation
operators
Textual
represent.
Define the textual representation of the model elements and
mutation operators by means of the modelText & mutaText DSLs
Generation and evaluation of
exercises with Wodel-Edu (4/8)

10. www.uam.es
Def.
concrete
syntax
Create MM
9/13
Def.
mutation
operators
Textual
represent.
Exercises
description
Configure the set of exercises to be generated by means of the
eduTest DSL
Generation and evaluation of
exercises with Wodel-Edu (5/8)

11. www.uam.es
Def.
concrete
syntax
Create MM
10/13
Automatic
generation
Def.
mutation
operators
Textual
represent.
Exercises
description
Generate the set of exercises for the target platform, currently
Moodle, the Web, Android or iOS
Generation and evaluation of
exercises with Wodel-Edu (6/8)

12. www.uam.es
Def.
concrete
syntax
Create MM
11/13
Automatic
generation
Exercises
solving
Def.
mutation
operators
Textual
represent.
Exercises
description
Publish the set of exercises ready to be solved
Generation and evaluation of
exercises with Wodel-Edu (7/8)

13. www.uam.es
Def.
concrete
syntax
Create MM
12/13
Automatic
generation
Exercises
solving
Automated
grading
Def.
mutation
operators
Textual
represent.
Exercises
description
Use the automated grading functionality to score the exercises
Generation and evaluation of
exercises with Wodel-Edu (8/8)

14. www.uam.es
13/13
Conclusions
• Wodel-Edu automates the generation and evaluation of on-line
exercises by using a model-based approach
• It is domain-independent and supports automated grading
• Enables a large-scale generation of seven kinds of exercises
• Automates the generation of seed models and alternative textual
representations
• Extend Wodel-Edu to support gamification and other types of exercises
(supporting interactivity via direct diagram manipulation, etc.)
• Use Wodel-Edu in other domains (software design, electric circuits, etc.)
Future work

15. www.uam.es
https://gomezabajo.github.io/Wodel/wodel-edu.html

16. www.uam.es
Generated exercises for Moodle

17. www.uam.es
Generated exercises for iOS*
*By Jaime Velázquez Pazos

18. www.uam.es
Generated exercises for Android*
*By Andrés Rico-Fernández

19. www.uam.es
Generated exercises for the Web

20. www.uam.es
Def.
concrete
syntax
Create MM
Automatic
generation
Exercises
solving
Automated
grading
Def.
mutation
operators
Textual
represent.
Exercises
description
Generation and evaluation of
exercises with Wodel-Edu