Usability Heuristics for Touchscreen-based Mobile Devices
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1 Usability Heuristics for Touchscreen-based Mobile Devices Advisor: Dr. Cristian Rusu. Pontificia Universidad Católica de Valparaíso Facultad de Ingeniería Escuela de Ingeniería Informática
2 Isabel Brown Caces PUCV, Valparaíso, Chile
3 Contents Introduction Problem definition Research Goals Methodology Mobile devices Usability Usability in touchscreen-based mobile devices Usability heuristics proposal Conclusions References
4 INTRODUCTION
5 Introduction Smartphones PIM Internet Connection + Apps
6 Introduction *Morgan Stanley (2009)
7 Introduction Context of Use Energy Capabilities Conectivity Processing Capabilities New Usability? Data Input/Output Methods Screen Size Screen Resolution *Zhang & Adipat (2005)
8 Introduction» Problem Definition Usability: Main attribute IS Quality (ISO 9126) IS Success (Deloan & McLean, 2003) Touchscreen-based Mobile Devices Smartphones very popular Large amount of functionalities The user interacts with the PUI.
9 RESEARCH
10 Research» Goals General Goal To establish a set of usability evaluation heuristics for touchscreenbased mobile devices. Specific Goals To analyze the characteristics, taxonomy, and elements of touchscreen-based mobile devices. To analyze usability attributes, rules, principles and evaluation methods. To propose a set of usability evaluation heuristics for touchscreenbased mobile devices. To validate the proposed set of usability evaluation heuristics for touchscreen-based mobile devices, through the use of heuristic evaluations and usability tests.
11 Research» Methodology Methodology Proposal A methodology to establish usability heuristics, C. Rusu, S. Roncagliolo, V. Rusu and C. Collazos, ACHI, pages 59 62, 2011 Case study
12 MOBILE DEVICES
13 Mobile Devices» Classification According to Schiefer y Decker (2008), which considers the following criteria: 1. Size and weight 2. Input modes 3. Output modes 4. Performance 5. Kind of usage 6. Communication capabilities 7. Type of operating system 8. Expandability
14 Mobile Devices» Classification Mobile Standard PC Mobile Internet Devices Handhelds/PDA Smartphones Feature Phones Simple Phones Special Terminals
15 USABILITY
16 Usability» ISO 9241 ISO defines usability as "The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use."
17 Usability» Nielsen s Usability Heuristics Visibility of system status Match between system and the real world User control and freedom Consistency and standards Error prevention Minimize the user's memory load Flexibility and efficiency of use Aesthetic and minimalist design Help users recognize, diagnose, and recover from errors Help and documentation *Jakob Nielsen (2005)
18 USABILITY IN TOUCHSCREEN-BASED MOBILE DEVICES
19 Usability in Touchscreen-based Mobile Devices Jakob Nielsen (1994) «Usability Engineering» Ketola & Röykkee (2001) User Interface Division 7 áreas Ham et al. (2009) A framework for evaluating the usability of mobile phones based on multi-level, hierarchical model of usability factors. Zhang & Adipat (2005) Challenges, Methodologies, and Issues in the Usability Testing of Mobile Applications
20 USABILITY HEURISTICS PROPOSAL
21 Proposal» First Iteration Guided Inspection Nokia X6 Samsung Galaxy S
22 Proposal» First Iteration A set of 11 Heuristics was proposed Positive and negative aspects. Specialists consulting.
23 Proposal» First Iteration Validation 2 Experiments Ecuador: 4 evaluators - similar experience. 2 use Nielsen s heuristics 2 use Proposed heuristics Chile: 6 evaluators beginners with a more experienced leader. 3 use Nielsen s heuristics 3 use Proposed heuristics Blackberry Storm Nokia N97
24 Proposal» First Iteration Validation Issues - 1st Experiment 43% 57% Proposal (3,19) Nielsen's (2,33)
25 Proposal» First Iteration Validation Issues 2nd Experiment 47% 53% Proposal (2,35) Nielsen's (1,62)
26 Proposal» First Iteration Validation Id Category Total Issues Severity Average Experiment P1 P2 Problems identified by both groups of evaluators Problems identified only by the group that used the set of heuristics defined at first iteration ,14 2, ,00 2,93 P3 Problems identified only by the group that used Nielsen s heuristics ,68 2,39 Total Why?
27 SECOND (FINAL) ITERATION
28 Proposal» Second Iteration Id TMD1 TMD2 TMD3 TMD4 TMD5 TMD6 TMD7 TMD8 TMD9 TMD10 TMD11 TMD12 Touchscreen-based mobile devices heuristics Definition Visibility of system status Match between system and the real world User control and freedom Consistency and standards Error prevention Minimize the user's memory load Customization and shortcuts Efficiency of use and performance Aesthetic and minimalist design Help users recognize, diagnose, and recover from errors Help and documentation Physical interaction and ergonomics
29 Proposal» Presentation TMD 3 User control and freedom Allow undo & redo "emergency exits" Options should be easy to find No long dialog sequences
30 Proposal» Presentation TMD 4 Consistency and standards Follow established conventions The same in the same way Standard and consistent
31 Proposal» Presentation TMD 7 Customization and shortcuts The system should provide basic and advanced configuration options. The system should allow customization and set shortcuts. The system should allow sorting and creation of groups of elements.
32 Proposal» Presentation TMD 12 Physical interaction and ergonomics The system should provide physical buttons or similar for main and/or recurrent functions. They should be placed in recognizable places, by the user. Device s dimensions, shape, weight and position of buttons or similar should fit the normal posture of the user s hand.
33 PROPOSAL VALIDATION
34 Proposal Validation 57% 32% 11% Nielsen (1,75) Both (0,47) Proposal (2,67)
35 CONCLUSIONS AND FUTURE WORK
36 Conclusions and Future Work A methodology for developing usability heuristics Success! Physical aspects affect usability! New techniques are required New set of heuristics (feedback new iteration?) New usability testing techniques How to design «usable» interfaces? Design patterns The development of a Checklist improved the Problem Detection.
37 Questions? Thank you.
38 Really You can ask Questions Thank you.
39 REFERENCES
40 References 1. Morgan Stanley. The Mobile Internet Report. Disponible en: Dongsong Zhang y Boonlit Adipat. Challenges, methodologies, and issues in the usability testing of mobile applications. Int. J. Hum. Comput. Interaction, 18(3): , Jakob Nielsen. Usability Engineering. Morgan Kaufmann Publishers, San Francisco, California, October Pekka Ketola Mika and Mika Röykkee. The three facets of usability in mobile handsets. In Proceeding of CHI 2001, Workshop, Mobile Communications: Understanding Users, Adoption & Design Sunday and Monday. ACM, Dong-Han Ham, Jeongyun Heo, Sanghyun Park, Chiwon Song, and Wan Chul Yoon. A framework for evaluating the usability of mobile phones based on multi-level, hierarchical model of usability factors. Interact. Comput., 21: , August 2009.
41 References 6. A. Baz, I. Ferreira, M. Álvarez, and R. García. Dispositivos Móviles. Memoria de Título Profesional de Ingeniero de Telecomunicaciónes, Universidad de Oviedo., Little Springs Design. A New Device Taxonomy. Disponible en: Gunther Schiefer and Michael Decker. Taxonomy for mobile terminals - a selective classification scheme. In Joaquim Filipe, David A. Marca, Boris Shishkov, and Marten van Sinderen, editors, ICE-B, pages INSTICC Press, Global Stats - Statcounter. Disponible en: revisado el 19/04/ Jakob Nielsen. Ten Usability Heuristics. Disponible en:
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