Outline two attempts to define abnormality.

infrequency: according to this definition, psychological abnormality can be defined as any characteristic or behaviour which in not normal, uncommon or unusual. Any behaviour or characteristic deviating significantly from this norm may therefore be considered to be abnormal. This definition has been used to identify people with abnormally low IQ scores. Since the average IQ is [?], anyone with an IQ which is significantly lower than this could be considered to have abnormally low intelligence.
Violation of : society can be thought of as having a set of unwritten rules and moral standards. Anyone who violates these may these may be regarded as abnormal. For example, if we saw someone spitting in church or singing loudly in the library, or having sex on a pavement, we would be likely to consider this behaviour to be very odd since this behaviour would not be expected of us in this context. At one time, homosexuality was considered to be abnormal because it was not what was expected or considered desirable by society.