Behavioral Observation Scales
1. Definition of Behavioral Observation Scales (BOS)
• Behavioral Observation Scales is frequency rating of critical incidents that worker has performed.
• The BOS was developed by Latham & Wexley (1977) who believed that both graphic rating scales and BARS require supervisors to make vague judgments.
• The BOS is a list of critical incidents behaviors which the supervisor has to rate in terms of frequency.
2. Rating scales
We use 5 scales as follows to identify frequency of behavior.
3. Identification of critical incidents
Items indicate either desired or undesired aspects of work performance, for examples :
• Worker misses workdays ________
• Worker never needs her/his work to be double checked _______