Why is the Permian mass extinction event often referred to as an event where life almost died? What do scientists believe caused this event and why did it result in such a catastrophic loss of diversity? 
Definitions:
Generosity Error
Error that occurs when an individual rates another person inaccurately because he or she identifies with the person being rated.
Interrater Reliability
When two or more raters observe or rank order a behavior in order to find the level of concordance between the raters. The higher the concordance, the higher the reliability.
The Halo Effect
A cognitive bias where the perception of positive qualities in one aspect leads to the unjustifiably favorable evaluation of other aspects.
Generosity Error
A bias in rating where the evaluator tends to give higher ratings than deserved, often due to a desire to be seen as favorable or kind.
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