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Related Experiment Video

Updated: Jun 6, 2026

Tactile Vibrating Toolkit and Driving Simulation Platform for Driving-Related Research

Tactile Vibrating Toolkit and Driving Simulation Platform for Driving-Related Research

Published on: December 18, 2020

Correlation between safety assessments in the driver-car interaction design process.

Robert Broström¹, Peter Bengtsson, Jakob Axelsson

¹Driver Interaction & Infotainment, Volvo Car Corporation, Göteborg, Sweden. rbrostr1@volvocars.com

Applied Ergonomics

|November 16, 2010

Summary

This study found a strong correlation between customer ratings and task efficiency metrics like task completion time and the NASA-Task Load Index (TLX) in driver-car interaction design. This suggests combining quantitative and expert evaluations can improve usability frameworks.

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Published on: September 18, 2012

Area of Science:

Human-Computer Interaction
Automotive Engineering
Usability Engineering

Background:

Modern vehicle functionality necessitates robust evaluation methods throughout driver-car interaction design.
Early identification and resolution of safety issues are critical for automotive manufacturers.
A key challenge is correlating formative evaluation methods used during development with summative methods applied post-launch.

Purpose of the Study:

To investigate the correlation between efficiency metrics from formative and summative evaluations in driver-car interaction.
To compare results from customer surveys with expert evaluations of vehicle systems.

Main Methods:

Analysis of the J.D. Power and Associates APEAL survey (approx. 2000 customers).
Expert evaluation study involving six evaluators assessing task completion time, NASA-Task Load Index (TLX), and Nielsen heuristics.
Comparison of efficiency metrics across customer ratings and expert assessments for sound and navigation systems.

Main Results:

High correlation observed between customer ratings and task completion time.
Significant correlation found between customer ratings and NASA-Task Load Index (TLX).
No correlation detected between Nielsen heuristics and customer ratings, task completion time, or TLX.

Conclusions:

A high degree of consistency across methodologies supports developing a unified usability evaluation framework.
Combining quantitative approaches with expert evaluations like task completion time is beneficial for driver-car interaction design.
The findings enable more effective and predictive usability assessments in automotive development.