Publication statistics
Pub. period:2007-2011
Pub. count:15
Number of co-authors:14
Co-authors
Number of publications with 3 favourite co-authors:
Daniel Goncalves:12Joaquim Jorge:8Hugo Nicolau:7 Productive colleagues
Tiago Guerreiro's 3 most productive colleagues in number of publications:
Joaquim A. Jorge:41Daniel Goncalves:28Joaquim Jorge:12
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...that strange new zone between medium and message. That zone we call the interface
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Tiago Guerreiro
Publications by Tiago Guerreiro (bibliography)
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Oliveira, João, Guerreiro, Tiago, Nicolau, Hugo, Jorge, Joaquim and Goncalves, Daniel (2011): Blind people and mobile touch-based text-entry: acknowledging the need for different flavors. In: Thirteenth Annual ACM SIGACCESS Conference on Assistive Technologies 2011. pp. 179-186.
“The emergence of touch-based mobile devices brought fresh and exciting possibilities. These came at the cost of a considerable number of novel challenges. They are particularly apparent with the blind population, as these devices lack tactile cues and are extremely visually demanding. Existing solutions resort to assistive screen reading software to compensate the lack of sight, still not all the information reaches the blind user. Good spatial ability is still required to have notion of the device and its interface, as well as the need to memorize buttons' position on screen. These abilities, as many other individual attributes as age, age of blindness onset or tactile sensibility are often forgotten, as the blind population is presented with the same methods ignoring capabilities and needs. Herein, we present a study with 13 blind people consisting of a touch screen text-entry task with four different methods. Results show that different capability levels have significant impact on performance and that this impact is related with the different methods' demands. These variances acknowledge the need of accounting for individual characteristics and giving space for difference, towards inclusive design.”
© All rights reserved Oliveira et al. and/or ACM Press
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Glória, Humberto, Guerreiro, Tiago and Goncalves, Daniel (2010): SmarterPhone: supporting meetings in a mobile context. In: Proceedings of the Sixth Nordic Conference on Human-Computer Interaction 2010. pp. 655-658.
“We must deal with growing amounts of information, leading to organizational and retrieval problems. This is particularly true in a mobile context. We describe how to proactively present the users with information relevant for a meeting, in a mobile context, based solely on the personal information available in their computers. We performed a study where 100 users were asked about what makes some information important for a given meeting, leading to the creation of SmarterPhone, a mobile application whose interface was crafted to enable users to efficiently access personally relevant information in a particular context. A user study showed that on average 80% of all relevant documents and people are found, demonstrating the validity of our approach and underlying relevance criteria.”
© All rights reserved Glória et al. and/or their publisher
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Benedito, João, Guerreiro, Tiago, Nicolau, Hugo and Goncalves, Daniel (2010): The key role of touch in non-visual mobile interaction. In: Proceedings of 12th Conference on Human-computer interaction with mobile devices and services 2010. pp. 379-380.
“Mobile devices are designed mostly to fit users with no particular disability. Tactile affordances are neglected at the expense of more attractive stylish interfaces and assistive solutions are stereotypical, also facing disabilities with a narrow perspective. A blind user is presented with screen reading software to overcome the inability to receive feedback from the device. However, these solutions go only half-way. In the absence of sight other capabilities stand up. Above all, the sense of touch plays an essential role while interacting with physical keypads. To empower these users, a deeper understanding of their capabilities and how they relate with technology is mandatory. We propose a user-product compatibility approach, taking in account that blind users have different tactile attributes. We expect to correlate the user's tactile sensitivity and keypad demands, enabling informed keypad design and selection.”
© All rights reserved Benedito et al. and/or their publisher
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Guerreiro, João, Guerreiro, Tiago and Goncalves, Daniel (2010): Surpassing farley files: opportunities and challenges on obtaining personally relevant information. In: Proceedings of 12th Conference on Human-computer interaction with mobile devices and services 2010. pp. 385-386.
“The proliferation of personal devices and their constant awareness of our interactions have generated an enormous amount of data that can be useful to help the user obtaining relevant information when needed. Our approach uses the personal information on users' devices, together with public online sources, to provide relevant information from the user point of view. The information from the users' devices, due to its personal and credible character, works as a filter to the retrieved from other less trustable and structured sources. A preliminary evaluation, suggested that we can provide the user with inter-connected relevant information from heterogeneous sources. However, we found some limitations that led us to our current research challenges.”
© All rights reserved Guerreiro et al. and/or their publisher
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Guerreiro, Tiago (2010): Assessing mobile-wise individual differences in the blind. In: Proceedings of 12th Conference on Human-computer interaction with mobile devices and services 2010. pp. 485-486.
“Every human is different. This diversity has not been given enough attention in mobile UI design. Disabled groups, with specific individual differences, face difficulties with traditional or stereotypical interfaces. My goal is to identify the individual features that influence mobile interaction, considering the blind, and match them with mobile interaction modalities in a comprehensive and extensible design space.”
© All rights reserved Guerreiro and/or his/her publisher
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Tomás, Nuno, Guerreiro, Tiago, Jorge, Joaquim A. and Goncalves, Daniel (2010): A narrative-based alternative to tagging. In: Proceedings of the 21st ACM Conference on Hypertext and Hypermedia 2010. pp. 189-194.
“The enormous dissemination of multimedia information over the past few years has led to mechanisms to support its organization, cataloging and search through descriptions or keywords. A popular way of associating such descriptions to content is tagging as can be found in popular sites such as Flickr (for images) or Delicious (bookmarks). This method allows users to associate tags to media, richly describing its content and may help in its retrieval at a later time. However, the process is mostly unstructured, leading to several problems. Nothing guarantees that the tags used are the most appropriate or the same tags are used in similar situations, making retrieval difficult.. Our approach relies on narrative-based interfaces which use stories as an organizing principle for tagging media. Given that humans have used stories to communicate since the dawn of time, narrative is a natural form of interaction. By inter-relating bits of information into a coherent whole, stories convey data in a rich, structured way. A study carried out with 40 users over a period of three months shows that users convey almost six times more information when using narratives to describe their media than what is typical of traditional methods. Furthermore, our pilot study saw narratives increasing tag reuse to”
© All rights reserved Tomás et al. and/or their publisher
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Guerreiro, Tiago, Nicolau, Hugo, Jorge, Joaquim and Goncalves, Daniel (2010): Towards accessible touch interfaces. In: Twelfth Annual ACM SIGACCESS Conference on Assistive Technologies 2010. pp. 19-26.
“Touch screen mobile devices bear the promise of endless leisure, communication, and productivity opportunities to motor-impaired people. Indeed, users with residual capacities in their upper extremities could benefit immensely from a device with no demands regarding strength. However, the precision required to effectively select a target without physical cues creates problems to people with limited motor abilities. Our goal is to thoroughly study mobile touch screen interfaces, their characteristics and parameterizations, thus providing the tools for informed interface design for motor-impaired users. We present an evaluation performed with 15 tetraplegic people that allowed us to understand the factors limiting user performance within a comprehensive set of interaction techniques (Tapping, Crossing, Exiting and Directional Gesturing) and parameterizations (Position, Size and Direction). Our results show that for each technique, accuracy and precision vary across different areas of the screen and directions, in a way that is directly dependent on target size. Overall, Tapping was both the preferred technique and among the most effective. This proves that it is possible to design inclusive unified interfaces for motor-impaired and able-bodied users once the correct parameterization or adaptability is assured.”
© All rights reserved Guerreiro et al. and/or their publisher
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Nicolau, Hugo, Guerreiro, Tiago, Jorge, Joaquim and Goncalves, Daniel (2010): Proficient blind users and mobile text-entry. In: Proceedings of the 2010 Annual European Conference on Cognitive Ergonomics 2010. pp. 19-22.
“Motivation -- Understand how NavTap, an assistive text-entry method, stands in relation to traditional approaches. Research approach -- We performed a between-subjects text-entry study with 12 blind users proficient with MultiTap and five blind users proficient with NavTap. Participants were asked to input ten sentences with different length and complexity. Findings/Design -- MultiTap significantly outperformed NavTap when considering text entry speed, confirming its theoretical advantage. However, when considering method effectiveness, NavTap's less experienced participants committed significantly fewer errors, indicating that it is both easier to learn and use, reaffirming it is an alternative for those unable to adjust to demanding adaptations. Research limitations/Implications -- Before NavTap appeared its users were unable to input text in a mobile device. Indeed, existing data make it difficult to assess differences between the users of either method. Further, NavTap users had less experience using the method (four months) than MultiTap (years). Originality/Value -- We contribute to understanding the limitations and merits of different text-entry approaches for blind people, after extensive usage. Take away message -- Different methods have different limitations and values. Selecting a match for a particular user may depend on his individual differences.”
© All rights reserved Nicolau et al. and/or their publisher
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Guerreiro, Tiago, Jorge, Joaquim and Goncalves, Daniel (2010): Identifying the relevant individual attributes for a successful non-visual mobile experience. In: Proceedings of the 2010 Annual European Conference on Cognitive Ergonomics 2010. pp. 27-30.
“Motivation -- To understand the individual differences with the greatest impact on a blind user's mobile interaction effectiveness and learning abilities. Research approach -- We performed a semi-structured interview to 10 specialized professionals (psychologists, occupational therapists, rehabilitation technicians, IT teacher) working closely with blind users. Findings/Design -- Results suggest that peripheral sensitivity, spatial ability, blindness onset age, age, intelligence and memory are the characteristics affecting user capabilities the most. Research limitations/Implications -- This study offers a wide view on the possible influencing attributes. Empirical studies are required to dissect the impact of each characteristic in mobile blind users' performance. Originality/Value -- We contribute with an understanding of the individual differences among the blind population that may affect mobile interaction. Take away message -- Individual differences among the blind have greater impact than those between sighted users. Understanding these differences is mandatory.”
© All rights reserved Guerreiro et al. and/or their publisher
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Pereira, Rita, Guerreiro, Tiago, Nicolau, Hugo, Goncalves, Daniel and Jorge, Joaquim (2010): Laying the groundwork for assisted rehabilitation. In: Proceedings of the 2010 Annual European Conference on Cognitive Ergonomics 2010. pp. 147-150.
“Motivation -- To provide to physical therapists a monitoring system with effective and accurate patient monitoring and evolution analysis. Research approach -- We analyzed therapy sessions with tetraplegic patients to better understand the rehabilitation process and highlight the major requirements for a technology-enhanced tool. We developed a prototype able to automate and improve the current monitoring and follow-up processes. Findings/Design -- Preliminary results indicate that computational movement analysis and comparison can improve the quality of a rehabilitation session and overall patient evolution analysis. Research limitations/Implications -- Analysis and studies have been performed in a rehabilitation centre with a limited set of therapists (3) and patients (7). Originality/Value -- The research herein contributes with a requirement analysis for a computer-assisted rehabilitation platform. We present a tracking-based system instantiating these requirements and outline its values after a preliminary informal validation. Take away message -- The capture and virtual playback of motion in physical therapy sessions increases therapist awareness of patient condition and evolution thus improving the rehabilitation process.”
© All rights reserved Pereira et al. and/or their publisher
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Nicolau, Hugo, Jorge, Joaquim and Guerreiro, Tiago (2009): Blobby: how to guide a blind person. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 3601-3606.
“For the majority of blind people, walking in unknown places is a very difficult, or even impossible, task to perform, when without help. The adoption of the white cane is the main aid to a blind user's mobility. However, the major difficulties arise in the orientation task. The lack of reference points and the inability to access visual cues are its main causes. We aim to overcome this issue allowing users to walk through unknown places, by receiving a familiar and easily understandable feedback. Our preliminary contributions are in understanding, through user studies, how blind users explore an unknown place, their difficulties, capabilities and needs. We also analyzed how these users create their own mental maps, verbalize a route and communicate with each other. Structuring and generalizing this information, we were able to create a prototype that generates familiar and adequate instructions, behaving like a blind companion, one with similar capabilities that understands his "friend" and speaks the same language. We evaluated the system with the target population, validating our approach and orientation guidelines, while gathering overall user satisfaction.”
© All rights reserved Nicolau et al. and/or ACM Press
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Tomás, Nuno, Guerreiro, Tiago and Goncalves, Daniel (2009): StoryTags: once upon a time, there was a photo. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 3967-3972.
“With the growing volume of digital information users must deal with, management and retrieval tasks have become increasingly problematic. A popular way to help users organize their information is tagging, as is the case in web sites such as flickr, delicious or youtube. Unlike traditional hierarchically-based organization principles, tagging is less strict and easier to employ. However, it is not without its own problems. Low tag reuse is just one of several issues that might hinder retrieval of a document or photo at a later time. We propose that narratives can provide a better way of tagging photos. Describing a photo by telling a story about it may yield more and better tags, as information in stories is organized as a structured, coherent whole. We present a prototype web application, StoryTags, that allows users to tell stories to tag their photos, and then to use those stories to retrieve them.”
© All rights reserved Tomás et al. and/or ACM Press
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Guerreiro, Tiago, Nicolau, Hugo, Jorge, Joaquim and Goncalves, Daniel (2009): NavTap: a long term study with excluded blind users. In: Eleventh Annual ACM SIGACCESS Conference on Assistive Technologies 2009. pp. 99-106.
“NavTap is a navigational method that enables blind users to input text in a mobile device by reducing the associated cognitive load. In this paper, we present studies that go beyond a laboratorial setting, exploring the methods' effectiveness and learnability as well as its influence on the users' daily lives. Eight blind users participated in designing the prototype (3 weeks) while five took part in the studies along 16 more weeks. Results gathered in controlled weekly sessions and real life usage logs enabled us to better understand NavTap's advantages and limitations. The method revealed itself both as easy to learn and improve. Indeed, users were able to better control their mobile devices to send SMS and use other tasks that require text input such as managing a phonebook, from day one, in real-life settings. While individual user profiles play an important role in determining their evolution, even less capable users (with age-induced impairments or cognitive difficulties), were able to perform the assigned tasks (sms, directory) both in the laboratory and in everyday use, showing continuous improvement to their skills. According to interviews, none were able to input text before. Nav-Tap dramatically changed their relation with mobile devices and noticeably improved their social interaction capabilities.”
© All rights reserved Guerreiro et al. and/or their publisher
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Câmara, Leonel, Guerreiro, Tiago, Goncalves, Daniel and Jorge, Joaquim A. (2008): Realfind: managing personal items in the physical world. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 3321-3326.
“While in recent years some effort has been put into helping users manage their personal information in their computers, little has been done to provide meaningful ways to organize and retrieve a user's personal physical objects. Nowadays, technologies such as RFID tags can help bridge the gap between the real and electronic worlds. We propose that a tool that keeps track of the users' objects and seamlessly inter-relates information about them with other relevant autobiographical and contextual data, about the users and their activities, can help manage and retrieve both physical and electronic items in meaningful ways. We describe a prototype tool, RealFind that allows this to take place in a synergistic and effective way. Objects can be searched for based on their properties, but also by relating them to a wide range of contextual information stored on their computers.”
© All rights reserved Câmara et al. and/or ACM Press
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Fernandes, Vitor, Guerreiro, Tiago, Araújo, Bruno, Jorge, Joaquim and Pereira, João (2007): Extensible middleware framework for multimodal interfaces in distributed environments. In: Proceedings of the 2007 International Conference on Multimodal Interfaces 2007. pp. 216-219.
“We present a framework to manage multimodal applications and interfaces in a reusable and extensible manner. We achieve this by focusing the architecture both on applications' needs and devices' capabilities. One particular domain we want to approach is collaborative environments where several modalities and applications make it necessary to provide for an extensible system combining diverse components across heterogeneous platforms on-the-fly. This paper describes the proposed framework and its main contributions in the context of an architectural application scenario. We demonstrate how to connect different non-conventional applications and input modalities around an immersive environment (tiled display wall).”
© All rights reserved Fernandes et al. and/or their publisher
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