An Ontology Engineering Approach to Gamify Collaborative Learning Scenarios. - Geiser Chalco Challco; Dilvan A. Moreira; Riichiro Mizoguchi; Seiji Isotani (CRIWG, 2014)

Towards an Ontology for Gamifying Collaborative Learning Scenarios. - Geiser Chalco Challco; Dilvan A. Moreira; Riichiro Mizoguchi; Seiji Isotani (Intelligent Tutoring Systems, 2014)

Towards a learning design authoring tool that generates personalized units of learning for CSCL. - Geiser Chalco Challco; Seiji Isotani (SAC, 2014)

Automated instructional design for CSCL: A hierarchical task network planning approach. - Geiser Chalco Challco; Marco Aurélio Gerosa; Ig Ibert Bittencourt; Seiji Isotani (Expert Syst. Appl., 2014)

Steps Towards the Gamification of Collaborative Learning Scenarios Supported by Ontologies. - Geiser Chalco Challco; Riichiro Mizoguchi; Ig Ibert Bittencourt; Seiji Isotani (AIED, 2015)

Gamification of Collaborative Learning Scenarios: Structuring Persuasive Strategies Using Game Elements and Ontologies. - Geiser Chalco Challco; Riichiro Mizoguchi; Ig Ibert Bittencourt; Seiji Isotani (SOCIALEDU, 2015)

Toward A Unified Modeling of Learner's Growth Process and Flow Theory. - Geiser Chalco Challco; Fernando R. H. Andrade; Simone S. Borges; Ig Ibert Bittencourt; Seiji Isotani (J. Educ. Technol. Soc., 2016)

Computer-based systems for automating instructional design of collaborative learning scenarios: a systematic literature review. - Geiser Chalco Challco; Ig Ibert Bittencourt; Seiji Isotani (Int. J. Knowl. Learn., 2016)

Step Towards a Model to Bridge the Gap between Personality Traits and Collaborative Learning Roles. - Rachel Carlos Duque Reis; Carla Lopes Rodriguez; Geiser Chalco Challco; Kamila Takayama Lyra; Leonardo B. Marques; Patrícia Augustin Jaques; Ig Ibert Bittencourt; Seiji Isotani (IxD&A, 2016)

An Ontology Framework to Apply Gamification in CSCL Scenarios as Persuasive Technology. - Geiser Chalco Challco; Riichiro Mizoguchi; Seiji Isotani (Revista Brasileira de Informática na Educ., 2016)

Using Ontology and Gamification to Improve Students' Participation and Motivation in CSCL. - Geiser Chalco Challco; Riichiro Mizoguchi; Seiji Isotani (HEFA, 2017)

A Plot from the Stars: Educational Game Development for Teaching Basic Mathematical Functions. - Gabriel Toschi de Oliveira; Claudio Fabiano Motta Toledo; Seiji Isotani; Geiser Chalco Challco; Hugo Henriques Pereira (CIG, 2018)

Gamification of collaborative learning scenarios: an ontological engineering approach to deal with the motivation problem caused by computer-supported collaborative learning scripts. - Geiser Chalco Challco (2018)

The Effects of Ontology-Based Gamification in Scripted Collaborative Learning. - Geiser Chalco Challco; Seiji Isotani; Ig Ibert Bittencourt (ICALT, 2019)

Can Ontologies Support the Gamification of Scripted Collaborative Learning Sessions? - Geiser Chalco Challco; Ig Ibert Bittencourt; Seiji Isotani (AIED (1), 2020)

Helping Teachers Assist Their Students in Gamified Adaptive Educational Systems: Towards a Gamification Analytics Tool. - Kamilla Tenório; Geiser Chalco Challco; Diego Dermeval; Bruno Lemos; Pedro Nascimento; Rodrigo Santos; Alan Pedro da Silva (AIED (2), 2020)

Investigating how gamified syllabic literacy impacts learning, flow and inappropriate behaviors: A single-subject study design. - Danielle Akemi Jogo; Geiser Chalco Challco; Ig Ibert Bittencourt; Marcelo Reis; Laíza Ribeiro Silva; Seiji Isotani (Int. J. Child Comput. Interact., 2022)

The Good and Bad of Stereotype Threats: Understanding Its Effects on Negative Thinking and Learning Performance in Gamified Tutoring. - Jessica Fernanda Silva Barbosa; Geiser Chalco Challco; Francys Rafael Do Nascimento Martins; Breno Felix de Sousa; Ig Ibert Bittencourt; Marcelo Reis; Jário José Santos; Seiji Isotani (AIED (Posters/Late Breaking Results/...), 2023)

Gamiflow: Towards a Flow Theory-Based Gamification Framework for Learning Scenarios. - Geiser Chalco Challco; Ig Ibert Bittencourt; Marcelo Reis; Jário José Santos; Seiji Isotani (AIED (Posters/Late Breaking Results/...), 2023)

AIED Unplugged: Leapfrogging the Digital Divide to Reach the Underserved. - Seiji Isotani; Ig Ibert Bittencourt; Geiser Chalco Challco; Diego Dermeval; Rafael Ferreira Mello (AIED (Posters/Late Breaking Results/...), 2023)

ITS Unplugged: Leapfrogging the Digital Divide for Teaching Numeracy Skills in Underserved Populations. - Thomaz Edson Veloso da Silva; Geiser Chalco Challco; Luiz Rodrigues 001; Fabiana Maris Versuti; Rodolfo Sena da Penha; Lívia Silva Oliveira; Guilherme Corredato Guerino; Luís Felipe Cavalcanti de Amorim; Marcelo Luiz Monteiro Marinho; Valmir Macario; Diego Dermeval; Ig Ibert Bittencourt; et al. (Human-AI Math Tutoring@AIED, 2023)

Even Boosting Stereotypes Increase the Gender Gap in Gamified Tutoring Systems: An Analysis of Self-efficacy, Flow and Learning. - Maria Takeshita; Geiser Chalco Challco; Marcelo Reis; Jário José Santos; Seiji Isotani; Ig Ibert Bittencourt (AIED (Posters/Late Breaking Results/...), 2023)

Revisão Sistemática da Literatura sobre Gamificação, Satisfação e Diversão na Educação. - José Silvino da Silva Neto; Bruna Damaris Ramos dos Santos; Breno Felix de Sousa; Ig Ibert Bittencourt; Geiser Chalco Challco (Revista Brasileira de Informática na Educ., 2023)

Unhappiness and Demotivation Among Students in Gamified Tutoring Systems: Toward Understanding the Gender Gap. - Kamila Benevides; Jário José Santos; Geiser Chalco Challco; Marcelo Reis; Alvaro Sobrinho; Leonardo Brandão Marques; Diego Dermeval; Rafael Ferreira Leite de Mello; Alan Silva; Seiji Isotani; Ig Ibert Bittencourt (AIED Companion (2), 2024)

Breaking the Cycle: AI Boosting Communication Skills of Low-Income Students in Brazil. - Renata Miranda de Gama; Geiser Chalco Challco; Jário José Santos; Marcelo Reis; Alvaro Sobrinho; Seiji Isotani; Ig Ibert Bittencourt (AIED Companion (1), 2024)

Knowledge Tracing Unplugged: From Data Collection to Model Deployment. - Luiz A. L. Rodrigues; Anderson P. Avila-Santos; Thomaz Edson Veloso da Silva; Rodolfo Sena da Penha; Carlos Neto; Geiser Chalco Challco; Ermesson L. dos Santos; Everton Souza; Guilherme Corredato Guerino; Thales Vieira; Marcelo Marinho; Valmir Macario; et al. (AIED (1), 2024)

Exploring the Impact of Gender Stereotypes on Motivation, Flow State, and Learning Performance in a Gamified Tutoring System. - Kelly Silva; Jário José Santos; Geiser Chalco Challco; Marcelo Reis; Leonardo Brandão Marques; Alan Silva; Alvaro Sobrinho; Diego Dermeval; Rafael Ferreira Leite de Mello; Ig Ibert Bittencourt; Seiji Isotani (AIED Companion (2), 2024)

AI in Education Unplugged Support Equity Between Rural and Urban Areas in Brazil. - Carlos S. Portela; Paula T. Palomino; Geiser Chalco Challco; Alvaro Sobrinho; Thiago Damasceno Cordeiro; Rafael Ferreira Leite de Mello; Diego Dermeval; Ig Ibert Bittencourt; Seiji Isotani (ICTD, 2024)

When boosting gender stereotypes increases flow experience and reduces self-handicapping in gamified tutoring systems. - João Vitor Lourenço Batista Do Nascimento; Jário José dos Santos Júnior; Geiser Chalco Challco; Ig Ibert Bittencourt (J. Braz. Comput. Soc., 2024)

Positive Artificial Intelligence in Education (P-AIED): A Roadmap. - Ig Ibert Bittencourt; Geiser Chalco Challco; Jário José Santos; Sheyla Fernandes; Jesana Silva; Naricla Batista; Claudio Hutz; Seiji Isotani (Int. J. Artif. Intell. Educ., 2024)

Does gender-stereotyped gamification increase negative thinking? Results from an experimental study with logic tutoring systems. - Jessica Fernanda Silva Barbosa; Geiser Chalco Challco; Ig Ibert Bittencourt (Interact. Learn. Environ., 2024)

Flow Experience, Performance Expectation and Performance: An LGBTQ+ Diversity Perspective on Gamified Systems. - Breno Felix de Sousa; Geiser Chalco Challco; Marcelo Reis; Jessica Fernanda Silva Barbosa; Francys Rafael Do Nascimento Martins; Seiji Isotani; Ig Ibert Bittencourt Santa Pinto (Revista Brasileira de Informática na Educ., 2025)

MathAIde: A Qualitative Study of Teachers' Perceptions of an ITS Unplugged for Underserved Regions. - Luiz A. L. Rodrigues; Guilherme Corredato Guerino; Thomaz Edson Veloso da Silva; Geiser Chalco Challco; Lívia Silva Oliveira; Rodolfo Sena da Penha; Rafael Ferreira Mello; Thales Vieira; Marcelo Marinho; Valmir Macario; Ig Ibert Bittencourt; Diego Dermeval; et al. (Int. J. Artif. Intell. Educ., 2025)

How does the Mechanics of Competition and Collaboration Impact on Student's Flow Experience in a Gamified Educational Environment? An Experimental Study in Higher Education (under review). - Alexandre Marinho; Ig Ibert Bittencourt; Diego Dermeval; Jário José Santos; Geiser Chalco Challco; Marcelo Reis (Technol. Knowl. Learn., 2025)

Effects of a collaborative gamification on learning and engagement of children with Autism. - Laíza Ribeiro Silva; Armando Maciel Toda; Geiser Chalco Challco; Nassim Chamel Elias; Ig Ibert Bittencourt; Seiji Isotani (Univers. Access Inf. Soc., 2025)