@Yousufzai

She is right. Criteria for abnormality is given in the Robert Feldman's book.

CHAPTER = 16 (Psychological Disorders)

Page = 537

Abnormality as deviation from the average;
Abnormality as deviation from the ideal;
Abnormality as a sense of subjective discomfort;
Abnormality as the inability to function effectively; and
Abnormality as a legal concept.

This is what I found. You are also suggested to google your question on the google.

IMRAN AHMAD SAJID (CSS-2010)

__________________
WHAT YOU SEEK IS SEEKING YOU
-----RUMI-----

I, ME,MY,MINE,YOU,YOURS-----a riddle to solve.
-------Imran-131-------