Principal Investigator Supervisor Co-Supervisor Edison Mukadah Proff Greg Foster Dr Hannah Slay

Background Exponential increase of mobile messaging SMS MMS Mobile Chatting …mxit

Problem Statement Mobile texting is slow Guinness world record:192 wpm vs 29 wpm

Problem Statement Cont… mini EV-K130 Xun Chi 138 F88 wrist watch Mobile Phone Miniaturisation of Mobile Device Faceplate Problem in fitting all the buttons

Objective of Project Design a New Interface and predictive Algorithm For improved text entry speed To cater for miniaturised devices To use a scroll wheel

Why choose a scroll wheel Saves Space To use agility of the thumb More feasible alternative to: Voice input Stylus based input Virtual Keyboards

Approach to Project

Literature Survey Voice Input

Developing The Interfaces Nokia 5300Nokia 7380 New Interface

Design and Implementation 5 Interfaces developed in flash T9 (Nokia 5300) Multi-Tap (Nokia 5300) scroll Wheel Non-Predictive (Nokia 7380) Scroll Wheel Predictive (Nokia 7380) Scroll Wheel Enhanced Prediction (New Algorithm)

Why Use Simulator No current phones with hardware capability To standardise experiment

User Testing To test interfaces in terms of : Text entry accuracy Text entry speed

Set-up Laptop Computer Connection Cables Mouse Speaker LCD Monitor

Procedure 10 users recruited 5 Interfaces tested 5 phrases per interface

Readability Scores

Phrases Used PhraseFlesch Reading Ease as % Do you like bad people?100 Our cause will be for all.100 I left you side cover.100 Did you like the rain?100 I like to ask young people a question.92.9 Average Score98.6

Results

Results Cont

Interpretations Speed Scroll wheel interfaces generally slower T9 gave the fastest text entry speed New Interface gave a 50% speed up compared to Nokia 7300 predictive algorithm New Interface gave a 300 % speed up compared to Nokia 7300 non-predictive algorithm

Interpretations Accuracy Scroll wheel interfaces generally more error prone T9 gave lowest error rate New Interface is slightly more error prone compared to Nokia 7300 predictive algorithm Nokia 7300 non-predictive was more difficult to use hence it had more errors.

Future Work Use a real hardware device Implement Contextual prediction Use a pressure sensing touch-pad to implement scrolling

Demo:

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