Historical incident data, defined

Incident Stereotype— A fixed or general pattern of incident causation. From a review of historical incident data it can be possible to identify classes of incidents, each with certain features (or typical, repeated patterns) in common that is, incident stereotypes are defined. 

Considerations of importance to the Working Group in the interpretation and evaluation of a particular study include (i) how clearly the agent was defined and, in the case of mixtures, how adequately the sample characterization was reported (ii) whether the dose was adequately monitored, particularly in inhalation experiments (iii) whether the doses and duration of treatment were appropriate and whether the survival of treated animals was similar to that of controls (iv) whether there were adequate numbers of animals per group (v) whether animals of each sex were used (vi) whether animals were allocated randomly to groups (vii) whether the duration of observation was adequate and (viii) whether the data were adequately reported. If available, recent data on the incidence of specific tumours in historical controls, as... 

Combustible Vapor Dispersion (CVD)— A mathematical estimation of the probability, location, and distance of a release of combustible vapors that will exist until dilution naturally reduces the concentration to below the lower explosive limit (LEL), or will no longer be considered ignitable (typically defined as 50% of the LEL). For basic studies, the normal expected wind direction is utilized (based on historical wind rose data). Real-time modeling is sometimes used during incident occurrence to depict area of vapor coverage on plant maps for visual understanding of the affected areas based on wind speeds and direction. 

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