In the sq4r method, what is the purpose of surveying?

An important essence of survey is to prevent overcrowding the reader's memory with different stories he read of previously.

Explanation:

SQ4R is an acronym which stands for Survey, Question, Read, Recite, Relate and Review. These items aid in learning. One can read more effectively and understand as well. Survey involves a peek at a chapter. Only the chapter's objectives, topic subheadings, picture captions and summary are important. This interesting peek gives you the reader, a hint before the real article is feasted on. One major essence of survey in SQ4R is it's ability to prevent overcrowding in the mind of the reader. During a survey, hints are picked up using keywords before the main article is supplied. Survey helps the reader with hinted on what to expect when the real article is ready. It kind of grants the reader an alternative from overcrowding his memory with different images belonging to different stories he read of previously.

glamis thou art, and cawdor; and shalt be what thou art promis'd; yet do i fear thy nature; it is too full o' the milk of human kindness to catch the nearest way: thou wouldst be great; art not without ambition; but without the illness should attend it. what thou wouldst highly, that wouldst thou holily; wouldst not play false, and yet wouldst wrongly win: thou'dst have, great glamis, that which cries, "thus thou must do, if thou have it: and that which rather thou dost fear to do than wishest should be undone." hie thee hither, that i may pour my spirits in thine ear; and chastise with the valor of my tongue all that impedes thee from the golden round, which fate and metaphysical aid doth seem to have thee crown'd withal.  

he lacks ambition.  

he is hesitant.  

he lacks courage.  

he has moral scruples.