tjvg@di.fc.ul.pt

Tiago Guerreiro

Associate Professor, Group Coordinator

Tiago Guerreiro is an Associate Professor at the University of Lisbon and a researcher at LASIGE. His research is focused on improving health, accessibility, and privacy, through and to technology, following a user-centred design approach. In these areas, he has published 75+ peer-reviewed papers. He received awards for 10+ papers, including at ASSETS, CHI, SOUPS, HRI and MHCI, and an ACM Best of Computing award in 2016. He is Editor-in-Chief for ACM Transactions on Accessible Computing. He is ASSETS 2020 General Chair. He was the Web for All General and Program Chair, in 2016 and 2015, respectively, was Chair of the “Accessibility & Aging” Subcommittee for CHI 2019, has been an associate chair for CHI in the last six editions, among many other service roles. He participated in 10+ EU and 1 IMI project. He was an expert evaluator for H2020 EU and ERA ICPermed calls and was an invited expert supporting the European Commission in implementing the Web Accessibility Directive. He is the President of his institution’s Ethics Review Board, the coordinator of LASIGE’s research line on Accessibility and Aging, and member of the coordination board of the Data Science Master. He leads the Tech&People Lab.

Publications

Exploring Collaboration in Programming Activities with Children with Visual Impairments: a 10-Session Study in a School Setting

Filipa Rocha, David Gonçalves, Ana Cristina Pires, Hugo Nicolau, Tiago Guerreiro

CSCW 2025 ‑ ACM Conference on Computer-Supported Cooperative Work and Social Computing, October, 2025

PDF
DOI

Workspace Awareness for Mixed-Visual Ability Children Collaborating in Tangible Programming Activities

Filipa Rocha, Hugo Simão, João Nogueira, Isabel Neto, Tiago Guerreiro, Hugo Nicolau

CHI 2025 ‑ ACM Conference on Human Factors in Computing Systems, April, 2025

PDF
DOI

Exploring Asymmetric Competitive Gaming For Mixed-Visual-Ability Pairs

Pedro Trindade, David Gonçalves, Pedro Pais, João Guerreiro, Tiago Guerreiro, André Rodrigues

VIDEOJOGOS 2024 ‑ International Conference on Videogame Sciences and Arts, December, 2024

PDF
Poster

Citizen-Led Personalization of User Interfaces: Investigating How People Customize Interfaces for Themselves and Others

Sérgio Alves, Ricardo Costa, Kyle Montague, Tiago Guerreiro

CSCW 2024 ‑ ACM Conference on Computer-Supported Cooperative Work and Social Computing, October, 2024

PDF
DOI

Crafting Virtual Realities: Designing a VR End-User Authoring Platform for Personalised Exposure Therapy

João P. Ferreira, Filipa Ferreira-Brito, João Guerreiro, Tiago Guerreiro

ISMAR 2024 ‑ 23rd IEEE International Symposium on Mixed and Augmented Reality

PDF

Projects

A chat application with the keyboard open and the written sentences displayed: Collects anywhere the user writes, Password and number fields are ignored, calculates more than 20 metrics

A privacy-aware keyboard toolkit for data collection in-the-wild. With it you will be able to collect everyday typing data, enabling continuous and spontaneous assessments, without collecting any sensitive information.

A keyboard scheme with dots representing each of the collected touch points. Each key as dots from a different color. There is a concentration of dots on the most used keys (e.g. a, s and space)

Accessible Text-Entry

For over 10 years we have investigated nonvisual text input on touchscreens. We have characterized in dept users’ behaviors and contributed with novel interfaces and interaction techniques.

Patient performing a jigsaw puzzle.

Biographical and Personalized Cognitive Stimulation

We explore how biographical information can improve cognitive stimulation and design interactive platforms to support people with dementia, clinicians, and families.

Hybrid-Brailler prototype (a) PCB components. (b) 3D-printed case attached to a mobile device with three rows of three buttons that are on the back of the device.

Haptics and mobile devices! In Braille I/O we have focused on bringing Braille back to the forefront of the digital era with novel techniques and a exploration of haptics to enable text input on mobile devices.

Clinical Assessemnt using Datapark

Data-Driven Healthcare

Our goal is to increase and improve the information clinicians and patients have access. We explore and develop mechanisms for collecting, processing, and analyzing the data. We also have a huge concern on how the information is presented.

Photo taken from the Workshop with children. Two visually impaired children perform a goal-directed programming activity using a map located on the table. The activity consists of moving the robot to reach the duck. The map is made of 4 EVA foam tiles with two different colors. The child on the right is concentrated in arranging the blocks while the children at the left are touching the duck after the robot reached the duck. This child is smiling and has much of his body on the table.

Inclusive education

We aim to develop technological solutions to enable an inclusive education for children with mixed abilities. We have mainly developed enhanced tangible objects for the acquisition of abstract concepts, such as mathematics or computational thinking. Besides the benefit of decreasing cognitive load and reinforcing understanding, manipulatives also support collaboration, making children more prone to divide, explore and share supporting cooperative actions.

A screenshot of the assistive play donor application. On the top side it shows a screenshot of fruit ninja with two traces, of two different swipes. Below a list of options to annotate which actions those traces correspond to. Finally, in the last third of the image, a timeline is shown with the limits of each gestured identified by the app.

Inclusive Gaming

By acknowledging that players have different needs and preferences, we explore strategies to create gaming experiences that are more engaging and inclusive to everyone!

Photo taken to a 2 years-old girl who is smiling and pointing to the camera.

Personalized Digital Interventions

We seek to tailor and personalize digital interventions to increase users motivation and adherence to the interventions. To this end, is crucial to gather a deep understanding of the intervention, context of use, benefits and difficulties associated and to accede to the mental models (goals, needs, motivations, etc) of the users.

The robot Baxter with his arms extended and a blind person feeling its hands

HRI for Health & Accessibility

Robots have a very particular set of skills. Skills that have been acquired over a vast amount of reasearch. Skills that make them powerful tools to leverage for social inclusion, accessibility and interaction.

A blind person interacting with his smarptphone using over the ear headphones

Smartphone Accessibility

From newcomers to experts, we have characterized the challenges that blind people overcome. We explored how to provide effective self-contained smartphone assistance with the ultimate goal of promoting self-efficacy.

A browser with the independent newspaper page open. On the right side a window where we can read: change what you wish. It has the options change sizes, change colours, order elements, remove elements and more options.

Personalization of User Interfaces

We explore solutions to increase the agency of individual users over the interfaces they use.

Storyboard demonstrating a shower attack.

Unauthorized Access to Smartphones

Unlike unlock authentication, which is an active defense against physical intrusion, passive defenses aim to primarily provide awareness, traceability, and recovery from intrusions; and to only secondarily engage counter-measures like blocking access. In sensitive computer systems, passive security is embodied in Intrusion Detection and Response (IDR) systems. To end-users, however, parallel capabilities remain unavailable, or lack security and usability validation, despite the severe privacy implications of intrusions. We thus envision a mobile IDR which is usable by individuals with no technical training; which can detect suspicious activity based on semantics of intrusion behavior; and which can respond to threats per their importance.