A grounded procedure for managing data and sample size of a home medical device assessment

Simone Borsci, Jennifer L. Martin, Julie Barnett

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The selection of participants for usability assessment, together with the minimum number of subjects required to obtain a set of reliable data, is a hot topic in Human Computer Interaction (HCI). Albeit, prominent contributions through the application of different p estimation models argued that five users provide a good benchmark when seeking to discover interaction problems a lot of studies have complained this five-user assumption. The sample size topic is today a central issue for the assessment of critical-systems, such as medical devices, because lacks in usability and, moreover, in the safety in use of these kind of products may seriously damage the final users. We argue that rely on one-size-fits-all solutions, such as the five-user assumption (for websites) or the mandated size of 15 users for major group (for medical device) lead manufactures to release unsafe product. Nevertheless, albeit there are no magic numbers for determining "a priori" the cohort size, by using a specific procedure it is possible to monitoring the sample discovery likelihood after the first five users in order to obtain reliable information about the gathered data and determine whether the problems discovered by the sample have a certain level of representativeness (i.e., reliability). We call this approach "Grounded Procedure" (GP).The goal of this study is to present the GP assumptions and steps, by exemplifying its application in the assessment of a home medical device.

Original languageEnglish
Title of host publicationHuman-Computer Interaction
Subtitle of host publicationHuman-Centred Design Approaches, Methods, Tools, and Environments - 15th International Conference, HCI International 2013, Proceedings
PublisherSpringer
Pages166-175
Number of pages10
ISBN (Print)9783642392313
DOIs
Publication statusPublished - 31 Jul 2013
Event15th International Conference on Human-Computer Interaction, HCI International 2013 - Las Vegas, NV, USA United States
Duration: 21 Jul 201326 Jul 2013

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
NumberPART 1
Volume8004

Conference

Conference15th International Conference on Human-Computer Interaction, HCI International 2013
CountryUSA United States
CityLas Vegas, NV
Period21/07/1326/07/13

Keywords

  • discovery likelihood
  • medical device
  • sample size
  • usability testing

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

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