Hi pankaj,
There are lot of things to be taken care of in posture assessment. Follow the following links there are two youtube videos and a Cisco document about this. I think that will be helpful to you.
Videos link:-
https://www.youtube.com/watch?v=pPL24z-J0Zc
https://www.youtube.com/watch?v=V8g86BnSUXg
Cisco document:-
http://www.cisco.com/c/en/us/td/docs/security/ise/2-0/admin_guide/b_ise_admin_guide_20/b_ise_admin_guide_20_chapter_010110.html
If this is helpful, please give it a thumbs up. :-)
Spooster IT Services Team