Publication statistics

Pub. period:1998-2014
Pub. count:28
Number of co-authors:47


Number of publications with 3 favourite co-authors:

Giulia Cassano:
Daniela Petrelli:
Leantros Kyriakoullis:



Productive colleagues

Antonella De Angeli's 3 most productive colleagues in number of publications:

Alistair G. Sutcli..:147
Maria Francesca Co..:67
Stefano Levialdi:55

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Antonella De Angeli

Picture of Antonella De Angeli.
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Has also published under the name of:
"A. De Angeli"

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I am an Associate Professor of Human-Computer Interaction at the Department of Information Engineering and Computer Science of the University of Trento in Italy. My research addresses cognitive, social and cultural aspects of information technologies with an emphasis on the application of this knowledge to interaction design.


Publications by Antonella De Angeli (bibliography)

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Angeli, Antonella De (2014). Commentary on 'Visual Aesthetics' by Noam Tractinsky

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Mehandjiev, Nikolay and Angeli, Antonella De (2012): Challenges in end user development for services. In: Proceedings of the 2012 International Conference on Advanced Visual Interfaces 2012. pp. 807-808.

The Third International Workshop on end user development for services (EUD4Services) focuses on the challenges faced by researchers and practitioners in applying End User Development ideas and principles to the area of service-oriented software design and construction. The topic is a natural development following on from two previous workshops which charted the territory of existing tools and research systems, and created a community of researchers and practitioners working in the area. This year edition aims to define a shared research agenda which can direct future work acting as a catalyst of joint effort towards the establishment of EUD for services.

© All rights reserved Mehandjiev and Angeli and/or ACM Press

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Staiano, Jacopo, Menndez, Mara, Battocchi, Alberto, Angeli, Antonella De and Sebe, Nicu (2012): UX_Mate: from facial expressions to UX evaluation. In: Proceedings of DIS12 Designing Interactive Systems 2012. pp. 741-750.

In this paper we propose and evaluate UX_Mate, a non-invasive system for the automatic assessment of User eXperience (UX). In addition, we contribute a novel database of annotated and synchronized videos of interactive behavior and facial expressions. UX_Mate is a modular system which tracks facial expressions of users, interprets them based on pre-set rules, and generates predictions about the occurrence of a target emotional state, which can be linked to interaction events. The system simplifies UX evaluation providing an indication of event occurrence. UX_Mate has several advantages compared to other state of the art systems: easy deployment in the user's natural environment, avoidance of invasive devices, and extreme cost reduction. The paper reports a pilot and a validation study on a total of 46 users, where UX_Mate was used for identifying interaction difficulties. The studies show encouraging results that open possibilities for automatic real-time UX evaluation in ecological environments.

© All rights reserved Staiano et al. and/or ACM Press

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Mansor, Evi Indriasari, Angeli, Antonella De and Bruijn, Oscar de (2009): The fantasy table. In: Proceedings of ACM IDC09 Interaction Design and Children 2009. pp. 70-79.

We explore the possibility of creating an interactive system which can foster fantasy play in preschool children in a tabletop environment. This paper reports our experiences designing and testing two prototypes with young children aged 3-4 years old. In the first study, we focused on understanding the similarities and differences between the type of play afforded by real objects and virtual objects. In the second study, we focused on testing solutions for the interaction difficulties evinced in the first study to see how to provide an engaging experience for children. Data were collected by observing children while they played with the study materials. Both quantitative and qualitative methods were used for data collection and analysis.

© All rights reserved Mansor et al. and/or ACM Press

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Angeli, Antonella De (2009): Ethical implications of verbal disinhibition with conversational agents. In Psychnology, 7 (1) pp. 49-57. 2

This paper presents a reflection on the ethical implications of conversational agents. The reflection is motivated by recent empirical findings showing that, when interacting in natural language with artificial partners, users tend to indulge in disinhibited behaviour, such as flaming, bullying and sexual harassment. The paper then addresses the question whether conversational agents open any ethical issues and whether this new communication context requires the definition of new moral values and principles or could be addressed by ordinary moral norms.

© All rights reserved Angeli and/or Psychnology.Org

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Costabile, Maria Francesca, Angeli, Antonella De, Lanzilotti, Rosa, Ardito, Carmelo, Buono, Paolo and Pederson, Thomas (2008): Explore! possibilities and challenges of mobile learning. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 145-154.

This paper reports the experimental studies we have performed to evaluate Explore!, an m-learning system that supports middle school students during a visit to an archaeological park. It exploits a learning technique called excursion-game, whose aim is to help students to acquire historical notions while playing and to make archaeological visits more effective and exciting. In order to understand the potentials and limitations of Explore!, our studies compare the experience of playing the excursion-game with and without technological support. The design and evaluation of Explore! have provided knowledge on the advantages and pitfalls of m-learning that may be instrumental in informing the current debate on e-learning.

© All rights reserved Costabile et al. and/or ACM Press

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Hartmann, Jan, Angeli, Antonella De and Sutcliffe, Alistair G. (2008): Framing the user experience: information biases on website quality judgement. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 855-864.

Understanding the complexities of users' judgements and user experience is a prerequisite for informing HCI design. Current user experience (UX) research emphasises that, beyond usability, non-instrumental aspects of system quality contribute to overall judgement and that the user experience is subjective and variable. Based on judgement and decision-making theory, we have previously demonstrated that judgement of websites can be influenced by contextual factors. This paper explores the strength of such contextual influence by investigating framing effects on user judgement of website quality. Two experimental studies investigate how the presentation of information about a website influences the user experience and the relative importance of individual quality attributes for overall judgement. Theoretical implications for the emerging field of UX research and practical implications for design are discussed.

© All rights reserved Hartmann et al. and/or ACM Press

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Hartmann, Jan, Sutcliffe, Alistair G. and Angeli, Antonella De (2008): Towards a theory of user judgment of aesthetics and user interface quality. In ACM Transactions on Computer-Human Interaction, 15 (4) p. 15.

The article introduces a framework for users' design quality judgments based on Adaptive Decision Making theory. The framework describes judgment on quality attributes (usability, content/functionality, aesthetics, customisation and engagement) with dependencies on decision making arising from the user's background, task and context. The framework is tested and refined by three experimental studies. The first two assessed judgment of quality attributes of websites with similar content but radically different designs for aesthetics and engagement. Halo effects were demonstrated whereby attribution of good quality on one attribute positively influenced judgment on another, even in the face of objective evidence to the contrary (e.g., usability errors). Users' judgment was also shown to be susceptible to framing effects of the task and their background. These appear to change the importance order of the quality attributes; hence, quality assessment of a design appears to be very context dependent. The third study assessed the influence of customisation by experiments on mobile services applications, and demonstrated that evaluation of customisation depends on the users' needs and motivation. The results are discussed in the context of the literature on aesthetic judgment, user experience and trade-offs between usability and hedonic/ludic design qualities.

© All rights reserved Hartmann et al. and/or ACM Press

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Mansor, Evi Indriasari, Angeli, Antonella De and Bruijn, Oscar de (2008): Little fingers on the tabletop: A usability evaluation in the kindergarten. In: Third IEEE International Workshop on Tabletops and Interactive Surfaces Tabletop 2008 October 1-3, 2008, Amsterdam, The Netherlands. pp. 93-96.

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Brahnam, Sheryl and Angeli, Antonella De (2008): Special issue on the abuse and misuse of social agents. In Interacting with Computers, 20 (3) pp. 287-291.

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Angeli, Antonella De and Brahnam, Sheryl (2008): I hate you! Disinhibition with virtual partners. In Interacting with Computers, 20 (3) pp. 302-310.

This paper presents a descriptive lexical analysis of spontaneous conversations between users and the 2005 Loebner prize winning chatterbot, Jabberwacky. The study was motivated in part by the suspicion that evidence in support of the Media Equation, especially in the field of conversational agents, was supported by incomplete data; too often omitted in its purview is the occurrence of unsavoury user responses. Our study shows that conversations with Jabberwacky often bring about the expression of negative verbal disinhibition. We discovered that 10% of the total stems in the corpus reflected abusive language, and approximately 11% of the sample addressed hard-core sex. Users were often rude and violated the conversation maxims of manner, quantity, and relevance. Also particularly pronounced in the conversations was a persistent need of the user to define the speakers' identities (human vs. machine). Users were also curious to understand and test the cognitive capabilities of the chatterbot. Our analysis indicates that the Media Equation may need qualifying, that users treat computers that talk, less as they do people and more as they might treat something not quite an object yet not quite human.

© All rights reserved Angeli and Brahnam and/or Elsevier Science

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Hartmann, Jan, Sutcliffe, Alistair G. and Angeli, Antonella De (2007): Investigating attractiveness in web user interfaces. In: Proceedings of ACM CHI 2007 Conference on Human Factors in Computing Systems 2007. pp. 387-396.

A theoretical framework for assessing the attractiveness of websites based on Adaptive Decision Making theory is introduced. The framework was developed into a questionnaire and used to evaluate three websites which shared the same brand and topic but differed in aesthetic design. The DSchool site was favoured overall and was best for aesthetics and usability. The subjective ratings of the sites were in conflict with the subject-reported comments on usability problems. Subjects were given two scenarios for their preference. They changed their preference from the DSchool to the HCI Group's site for the more serious (PhD study) scenario; however, design background students remained loyal to the DSchool. The implications of framing and halo effects on users' judgement of aesthetics are discussed.

© All rights reserved Hartmann et al. and/or ACM Press

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Badre, Albert N., Levialdi, Stefano, Foley, Jim, Thomas, John, Strohecker, Carol, Angeli, Antonella De, Ram, Preetha, Ram, Ashwin and Sanchez, Jaime (2007): Human Centric E-Learning and the Challenge of Cultural Localization. In: Baranauskas, Maria Ceclia Calani, Palanque, Philippe A., Abascal, Julio and Barbosa, Simone Diniz Junqueira (eds.) DEGAS 2007 - Proceedings of the 1st International Workshop on Design and Evaluation of e-Government Applications and Services September 11th, 2007, Rio de Janeiro, Brazil. pp. 690-691.

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Bruijn, Oscar de, Angeli, Antonella De and Sutcliffe, Alistair G. (2007): Customer experience requirements for e-commerce websites. In Int. J. Web Eng. Technol., 3 (4) pp. 441-464.

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Angeli, Antonella De, Sutcliffe, Alistair G. and Hartmann, Jan (2006): Interaction, usability and aesthetics: what influences users' preferences?. In: Proceedings of DIS06: Designing Interactive Systems: Processes, Practices, Methods, & Techniques 2006. pp. 271-280.

In this paper we describe an evaluation of two websites with the same content but different interface styles (traditional menu-based and interactive metaphors). A formative usability evaluation was carried out with heuristic assessment of aesthetics, and questionnaire assessment of aesthetics, content, information quality, usability and post-test memory. The study revealed that perception of information quality is affected by the interaction style implemented in the interface, in a manner resembling the halo effect in person perception. Implications for website design and evaluation are discussed.

© All rights reserved Angeli et al. and/or ACM Press

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Angeli, Antonella De and Kyriakoullis, Leantros (2006): Globalisation vs. localisation in e-commerce: cultural-aware interaction design. In: Celentano, Augusto (ed.) AVI 2006 - Proceedings of the working conference on Advanced visual interfaces May 23-26, 2006, Venezia, Italy. pp. 250-253.

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Angeli, Antonella De, Coventry, Lynne, Johnson, Graham and Renaud, Karen (2005): Is a picture really worth a thousand words? Exploring the feasibility of graphical authentication systems. In International Journal of Human-Computer Studies, 63 (1) pp. 128-152.

The weakness of knowledge-based authentication systems, such as passwords and Personal Identification Numbers (PINs), is well known, and reflects an uneasy compromise between security and human memory constraints. Research has been undertaken for some years now into the feasibility of graphical authentication mechanisms in the hope that these will provide a more secure and memorable alternative. The graphical approach substitutes the exact recall of alphanumeric codes with the recognition of previously learnt pictures, a skill at which humans are remarkably proficient. So far, little attention has been devoted to usability, and initial research has failed to conclusively establish significant memory improvement. This paper reports two user studies comparing several implementations of the graphical approach with PINs. Results demonstrate that pictures can be a solution to some problems relating to traditional knowledge-based authentication but that they are not a simple panacea, since a poor design can eliminate the picture superiority effect in memory. The paper concludes by discussing the potential of the graphical approach and providing guidelines for developers contemplating using these mechanisms.

© All rights reserved Angeli et al. and/or Academic Press

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Sutcliffe, Alistair G. and Angeli, Antonella De (2005): Assessing Interaction Styles in Web User Interfaces. In: Proceedings of IFIP INTERACT05: Human-Computer Interaction 2005. pp. 405-417.

An evaluation of two websites with the same content but different interface styles (traditional menu-based and interactive metaphors) is described. A formative usability evaluation was carried out with heuristic assessment of aesthetics followed by post-test memory. The subjects had more problems with the metaphor-based site, but rated it more favourably on the aesthetics heuristics. There was no difference in free memory recall between the sites. The implications for website design and evaluation are discussed.

© All rights reserved Sutcliffe and Angeli and/or Springer Verlag

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Angeli, Antonella De, Athavankar, Uday, Joshi, Anirudha, Coventry, Lynne and Johnson, Graham I. (2004): Introducing ATMs in India: a contextual inquiry. In Interacting with Computers, 16 (1) pp. 29-44.

This paper presents a method and results of an ethnographic study aimed at building an understanding of Automatic Teller Machine (ATM) adoption in Mumbai, India. The study combined field observations and semi-structured interviews (N=43) of early ATM adopters, bank customers who do not use ATMs, and people who used the ATM for the first time as part of our research. Data were analysed to identify specific cultural traits that may affect the adoption of ATMs in urban India. Results demonstrated the unique role of the cultural context in affecting users' expectations and behavioural possibilities, thus determining people's response to the machine. This led to the conclusion that an understanding of cultural biases and metaphors can facilitate technology diffusion and acceptance informing design localisation and supporting the development of strategies to motivate and train users.

© All rights reserved Angeli et al. and/or Elsevier Science

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Renaud, Karen and Angeli, Antonella De (2004): My password is here! An investigation into visuo-spatial authentication mechanisms. In Interacting with Computers, 16 (6) pp. 1017-1041.

Passwords are the almost universal authentication mechanism, even though they are basically flawed and cause problems for users due to poor memorability. Graphical methods of authentication have recently excited some interest but little is known about their actual efficacy. There are basically two types of graphical authentication mechanisms: recognition-based and location-based -- also called visuo-spatial mechanisms. Whereas some kinds of recognition-based graphical authentication mechanisms have been evaluated by various researchers, there is still a need to investigate location-based graphical authentication mechanisms in a more rigorous fashion to determine whether they could be a viable alternative to traditional passwords for web usage. This paper discusses graphical authentication mechanisms in general and reports on the evaluation of one particular visuo-spatial mechanism, aimed at augmenting the password paradigm by providing a way to record passwords securely. Results and findings are presented, and conclusions drawn, some of which can also be applied to other types of visuo-spatial mechanisms. We also propose a set of metrics which can be used to measure the quality of web authentication mechanisms and apply these to a range of existing authentication mechanisms.

© All rights reserved Renaud and Angeli and/or Elsevier Science

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Coventry, Lynne, Angeli, Antonella De and Johnson, Graham I. (2003): Usability and biometric verification at the ATM interface. In: Cockton, Gilbert and Korhonen, Panu (eds.) Proceedings of the ACM CHI 2003 Human Factors in Computing Systems Conference April 5-10, 2003, Ft. Lauderdale, Florida, USA. pp. 153-160.

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Angeli, Antonella De, Matera, M., Costabile, Maria Francesca, Garzotto, F. and Paolini, P. (2003): On the Advantages of a Systematic Inspection for Evaluating Hypermedia Usability. In International Journal of Human-Computer Interaction, 15 (3) pp. 315-335.

It is indubitable that usability inspection of complex hypermedia is still an "art," in the sense that a great deal is left to the skills, experience, and ability of the inspectors. Training inspectors is difficult and often quite expensive. The Systematic Usability Evaluation (SUE) inspection technique has been proposed to help usability inspectors share and transfer their evaluation know-how, to simplify the hypermedia inspection process for newcomers, and to achieve more effective and efficient evaluation results. SUE inspection is based on the use of evaluation patterns, called abstract tasks, which precisely describe the activities to be performed by evaluators during inspection. This article highlights the advantages of this inspection technique by presenting its empirical validation through a controlled experiment. Two groups of novice inspectors were asked to evaluate a commercial hypermedia CD-ROM by applying the SUE inspection or traditional heuristic evaluation. The comparison was based on three major dimensions: effectiveness, efficiency, and satisfaction. Results indicate a clear advantage of the SUE inspection over the traditional inspection on all dimensions, demonstrating that abstract tasks are efficient tools to drive the evaluator's performance.

© All rights reserved Angeli et al. and/or Lawrence Erlbaum Associates

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Costabile, Maria Francesca, Angeli, Antonella De, Pittarello, F. and Ardito, C. (2003): Can Audio Help Navigating in Virtual Environments? An Experimental Ecaluation. In: Proceedings of IFIP INTERACT03: Human-Computer Interaction 2003, Zurich, Switzerland. p. 733.

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Angeli, Antonella De, Lynch, P. and Johnson, G. (2001): Personifying the e-Market: A Framework for Social Agents. In: Proceedings of IFIP INTERACT01: Human-Computer Interaction 2001, Tokyo, Japan. pp. 198-205.

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Costabile, Maria Francesca, Angeli, Antonella De and Matera, Maristella (2001): Guiding Usability Evaluators During Hypermedia Inspection. In: HCC 2001 - IEEE CS International Symposium on Human-Centric Computing Languages and Environments September 5-7, 2001, Stresa, Italy. pp. 332-333.

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Toffetti, A., Nodari, E., Zoldan, C., Angeli, Antonella De and Gerbin, W. (2000): Age-Related Differences in Driver-INFO2000 Interaction. In: Emiliani, Pier Luigi and Stephanidis, Constantine (eds.) Proceedings of the 6th ERCIM Workshop on User Interfaces for All October 25-26, 2000, Florence, Italy. p. 2.

These pages summarize the user-based evaluation of INFO2000, the prototype of a multifunctional in-car information system. The aim of the study was to investigate the very first impact of INFO2000 on both young and elderly potential users. It emerged that INFO2000 was initially less usable for elderly. Nevertheless, this difference tended to diminish with the practice and the elderly attitude towards the system was positive.

© All rights reserved Toffetti et al. and/or The European Research Consortium for Informatics and Mathematics - ERCIM

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Angeli, Antonella De, Matera, Maristella, Costabile, Maria Francesca, Garzotto, Franca and Paolini, Paolo (2000): Validating the SUE Inspection Technique. In: Advanced Visual Interfaces 2000 2000. pp. 143-150.

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Angeli, Antonella De, Gerbino, Walter, Cassano, Giulia and Petrelli, Daniela (1998): Visual display, pointing, and natural language: the power of multimodal interaction. In: Catarci, Tiziana, Costabile, Maria Francesca, Santucci, Giuseppe and Tarantino, Laura (eds.) AVI 1998 - Proceedings of the working conference on Advanced Visual Interfaces May 24 - 27, 1998, LAquila, Italy. pp. 164-173.

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