Use this URL to cite or link to this record in EThOS:
Title: Designing number entry user interfaces : a focus on interactive medical devices
Author: Oladimeji, Patrick
ISNI:       0000 0004 7425 4716
Awarding Body: Swansea University
Current Institution: Swansea University
Date of Award: 2014
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Please try the link below.
Access from Institution:
Number entry is a crucial aspect of using many interactive systems. Tasks such as withdrawing money from an ATM, selecting a TV channel, manually tuning into a radio station, or setting up an infusion pump for drug delivery, all involve entering or selecting numbers. The number entry aspects of these tasks are usually secondary to the user's goal. Users typically have higher level goals which might involve a sub-task related to entering numbers. As a result, number entry is assumed to be simple, straight forward and uninteresting. The design of number entry interfaces dates back as early as the use of tally sticks and counting boards although modern interfaces did not emerge until the design of the first mechanical calculator in the 17th century. The nature of numbers allows interfaces to be designed that exploit the specification of individual digits of the number as well as making incremental changes to the entire number. The diversity in interface design is not evident in current research which is dominated by various forms of evaluations of the numeric keypad interface. This thesis undertakes a historical review of the design of number entry interfaces and then explores the design space within which they lie while proposing a classification for the different styles of interfaces. It then evaluates several example alternatives to the numeric keypad, specifically those in use on infusion pumps in hospitals using both exhaustive simulations and usability studies. These evaluations explore the effects of interface styles on error detection, speed, error severity and error type. This research concludes by identifying properties for performing relative comparisons of interfaces and uncovers design trade-offs th at will help inform decisions about the safety and dependability of number entry interfaces.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available