In assessing the effects of environmental stress three points are made. (1) Comfort and working efficiency cannot necessarily be equated. (2) The optimal experimental design for assessing individual differences differs fundamentaly from that required for establishing population means. Reliable individual differences will only be revealed by repeated measures of a given effect upon the same people and under the same conditions. (3) Regarding the assessment of what individuals find comfortable as regards temperature, or acceptable as regards noise, two difficulties are noted. (a) In terms of what they are prepared to do about it, individuals may differ in what they mean when they tick one of a number of terms indicating varying degrees of discomfort or annoyance. (b) Where an observer experiences a range of conditions he will tend to place the center point of the rating scale at the center of the range of conditions sampled. Over a group of observers this may bias the average comfort or acceptability vote away from its true point. The presentation of a standard followed by a single test condition will avoid difficulties due to range effects but may encounter others due to suggestion or contrast effects.

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  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Wilkinson, R T
  • Publication Date: 1974-11

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Subject/Index Terms

Filing Info

  • Accession Number: 00095625
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jul 24 1976 12:00AM