The following steps are:-
1)To understand what the passage is about,read it carefully.Put down the main theme in a sentence or phrase.
Also think a suitable title for it .
2)Read through the passage again,and make sure that no hint or suggestion escapes you.The time underline the key words ,phrases,clauses and sentences.
3)Select the essential points,jot them down and reject the rest.
4)prepare your first draft on the basis of underlined key words,phrases etc.and the essential points you have jotted down.
5)Compare your draft with the original to check for any omissions and irrelevancies.
6)Check the length of the precis.....