___________________________________________________________________________________________________________________ NASA TASK LOAD INDEX- Survey (NASA TLX) ___________________________________________________________________________________________________________________ last updated: 10-02-2020 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 10-02-2020 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements the NASA TASK LOAD INDEX a tool to assess perceived workload References: NASA (1986). Nasa Task Load Index (TLX) v. 1.0 Manual Hart, S. (2006). Nasa-Task Load Index (Nasa-TLX); 20 Years Later. Human Factors and Ergonomics Society Annual Meeting Proceedings, 50, 904-908. ___________________________________________________________________________________________________________________ OVERVIEW ___________________________________________________________________________________________________________________ The NASA TLX consists of six subscales: Mental Demands, Physical Demands, and Temporal Demands, Frustration, Effort, and Performance ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes less than a minute to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: Raw data file: 'nasatlx.iqdat' date, time: date and time script was run with the current group/subjectnumber subject, group, session: with the current subject/groupnumber/session id build: the Inquisit build q*_response: response given (in assigned values) Scale: 1 (very low) - 21 (very high) q*_latency: how much time (in ms) the participant spent on the surveypage with this particular question (the last time this particular surveypage was visited) (2) Summary data file: 'nasatlx_summary*.iqdat' (a separate file for each participant)* inquisit.version: Inquisit version run computer.platform: the platform the script was run on (win/mac/ios/android) startDate: date script was run startTime: time script was started subjectid: assigned subject id number groupid: assigned group id number sessionid: assigned session id number elapsedTime: time it took to run script (in ms); measured from onset to offset of script completed: 0 = script was not completed (prematurely aborted); 1 = script was completed (all conditions run) textbox.name.response: entered name textbox.date.response: entered date textbox.task.response: entered task Raw responses on the sliders: slider.effort.response, slider.frustration.response, slider.mentaldemand.response, slider.performance.response, slider.physicaldemand.response, slider.temporaldemand.response