Applying HTA method to the design of context-aware indoor navigation for the visually-impaired

ABSTRACT

This paper discusses an Indoor Navigation Model proposed for visually impaired people. The model aims at tailoring Context-aware Indoor Navigation (CAIN) applications to the users' tasks, intentions, and situations. To achieve this, the model is novelly designed to follow the guidelines of Hierarchical Task Analysis (HTA). Usability implications and requirements for the design of this indoor navigation model are discussed. The integration of HTA method makes the design of CAIN model focus on the higher level system design issues. The results (user, user-application, and application tasks) of HTA are used to design interfaces and algorithms. A framework of command interfaces for executing interaction between application tasks and user tasks in this model is reported in this paper.

REFERENCES

• 1: ENABLED - Enhanced Network Accessibility for the Blind and Visually Impaired. European Project Number FP6-2003-IST-2-004778, http://www.enabledweb.org.
• 2: http://www.pulsedata.com/Products/Notetakers/BrailleNoteGPS.asp, Braille Note GPS Product Page. Humanware, March 2006.
• 3: http://www.humanware.ca/web/en/p_DA_Trekker.asp, Trekker Navigation System, Product Information. Humanware, March 2006.
• 4: http://www.ekahau.com, The Ekahau Positioning System Homepage. March 2006
• 5: Nissanka B. Priyantha , Anit Chakraborty , Hari Balakrishnan, The Cricket location-support system, Proceedings of the 6th annual international conference on Mobile computing and networking, p.32-43, August 06-11, 2000, Boston, Massachusetts, United States [doi>10.1145/345910.345917]
• 6: http://www.euroblind.org/fichiersGB/STAT.htm, Statistical Data on blind and partially sighted people in European countries. European Blind Union, 2002
• 7: Yun-Maw Cheng, Wai Yu, Chris Johnson, and Tsang-Long Pao, How Task Analysis can Prime the Design of Context-Aware Technologies. International Conference on Multidisciplinary Information Science and Technologies (INSCIT2006), Oct. 2006, 25--28.
• 8: Dan Diaper , Colston Sanger, Tasks for and tasks in human-computer interaction, Interacting with Computers, v.18 n.1, p.117-138, January, 2006 [doi>10.1016/j.intcom.2005.06.004]
• 9: ENABLED internal deliverable D.4.2.3 Integration of Selected Indoor Location Detection and Navigation Support Technologies into ENABLED Test Environment. European Project Number FP6-2003-IST-2-004778, 2006.
• 10: http://www.xbow.com/Home/HomePage.aspx, The Crossbow Wireless Sensor Networks Homepage, March 2007.

INDEX TERMS

Primary Classification:
  H. Information Systems
  H.1 MODELS AND PRINCIPLES
      H.1.2 User/Machine Systems
          Subjects: Human factors

General Terms:
Algorithms, Design, Human Factors, Standardization

Keywords:
HCI, HTA, indoor navigation model, scenario, visually impaired people