Statistical abnormality is when a persons behaviour or trait is rare or statistically unusual.
Strength: Provides an objective way, based on data, to define abnormality.
Deviation from social norms is when a persons thinking or behaviour violates the (unwritten) rules about what is acceptable behaviour in a social group.
Limitation: Social norms vary from culture to culture. This means that what is considered normal in one culture may be considered abnormal in another. This is called cultural relativism.
Failure to function adequately is when a person cant carry out a range of behaviours that society would expect. For example, getting out of bed, holding a job.
Strength: Provides practical checklist that can be used to check abnormality.
Limitation: F.F.A may not be linked to abnormality, but other factors. For example, failing to hold a job is more likely due to the economic situation.
Deviation from idea mental health: Six criteria (Resistance to stress, growth, high self-esteem, autonomy, accurate perception of reality) If even 1 isn't met then your abnormal.
Limitation: These ideas are culturally bound, based on western ideas of ideal mental health, and should not be used to judge other cultures.