ERIC Number: ED260690
Record Type: Non-Journal
Publication Date: 1985-May-30
Reference Count: N/A
An Exploratory Study of the Effect of Screen Size and Resolution on the Legibility of Graphics in Automated Job Performance Aids. Final Report.
Dwyer, Daniel J.
Designed to assess the effect of alternative display (CRT) screen sizes and resolution levels on user ability to identify and locate printed circuit (PC) board points, this study is the first in a protracted research program on the legibility of graphics in computer-based job aids. Air Force maintenance training pipeline students (35 male and 1 female) served as participants in the study, which examined three cathode ray tube (CRT) screen sizes (5"X5", 9"X9", and 12"X12") and four levels of resolution (35, 70, 140 and 280 dots/pixels per inch), and assessed the impact of changes in these variables on locator task performance. The screen sizes were selected as representative of the range of display screens commercially available. The task involved locating test points (i.e., components and solder connections) on two actual PC boards (one component side and one pin side) based on test points identified in a graphic display. The report includes: (1) background information; (2) test methods, including sample, apparatus, procedure, design and analysis, and performance measures; (3) results, including response accuracy and response time; (4) conclusions; (5) references; (6) a four-page bibliography; and (7) appendices, which include a summary of past research, the verbal instructions to students, student instructions presented on CRT, and data tables. Findings showed that the smallest screen could not be used for graphics with high information density and low discriminability, but the two larger screens were adequate for all tested information. (JB)
Publication Type: Reports - Evaluative
Education Level: N/A
Authoring Institution: Air Force Human Resources Lab., Brooks AFB, TX.; Naval Training Equipment Center, Orlando, FL.