Four studies were conducted in order to clarify the importance of student proctors and mastery performance in PSI systems.

The purpose of this article is to demonstrate the method and value of through its application to reported personal injuries to roof bolters. The technique involves anaysis of accident narratives in order to classify the reported injuries according to where they occurred in the roof bolter's work cycle. Microadysis allows an investigator to use the narrative descriptions to firame the conditions and situations under which miuers were injured, results which then may be used in annual refksher training to make breakout sessions site and job specific. A combination of microanalysis and work-site observaselected work routines, to calculate new accident indices, to characterize the situations and conditions surrounding the accidents, and to desaibe the causes of many of the accidents in work-related terms. AL~~~~~E,R.C.;K~~~~,MJ.;GRAYSON,R.L:M~CR~ANALYS~SOFROOFBOLTW~~~-WES. Am. WP. EMIIRoN. HYG. 12( 12)851-857; 1597.0 1997 AM. tions of roof bolters was used in this study to classify accidents into SummaryThe objective of a 1983-1990 research project was to examine work-related injuries to miners by focusing on sequences of work activities, thus attempting to identifl specific conditions and situations in which miners were exposed to hazards. One part of the research concentrated on injuries during roof bolting, the most hazardous underground mining job at the time. During the course of the study, the authors developed and applied two methods of analysis: (1) detailed microanalysis of accident data and (2) formalized workplace observations of work procedures. The microanalysis of reportable accidents, when coupled with other observational data, assisted the researchers in identifjmg the situations, conditions, and performance errors that exposed roof bolters to hazards.About 3600 bolting-related accidents (not all were injuries), reported in the West Virginia Safety Information System (WVSIS) between 1983 and 1990, were examined. The analysis showed that 2685 reported personal injury incidents occurred at the face during production processes. In a large number of cases, the analysis identified specific job tasks, as well as the causes of the injuries. The injury incidents were organized according to four roof bolting routines and later analyzed for severity. Results showed that fills of roof material accounted for 40% of the injuries. Of the work routines, drilling bolt holes and h a n h "steels" produced 32% of the injuries, while 25% of them occurred during bolt installation, 23% during tramming and positioning the bolter, and 20% during hce preparation work. The researchers developed specific severity-weighted indices to help determine the risk of injury when roof bolters were performing different tasks during the work cycle.Since microanalyses of injuries revealed different risks for different work routines, detailed results of the microanalyses were used to design countermeasures that addressed deviations fiom desired worker performances and to h e better supervisox-labor interactions in the workplace. Intervention...

No abstract