Even if a pattern of behaviour is almost universal, we can't know in advance if it is a law of nature we cannot change or simply a remnant of our primitive past that we can and should modify.

That allowed Mr Allen to assess which parameters contribute to each species's pattern, and thus which are correlated with behaviour.

The last thing listed here is very important - the behaviour pattern must be interfering with the person's ability to get on with his life, to learn or to fit in with his or her world.