the third definition of abnormality is failure to function adequately. this when you fail to perform everyday tasks
a strength of the failure to function adequately definition is that the behaviours used to identify abnormality can be easily observed and measured
a weakness of the failure to function adequately definition is that he definition fails to identify people who do cope well with everyday life, but that have a mental disorder.
a weakness of the failure to function adequately definition is that we all sometimes behave in ways that are bad for us and cause us not to cope