On what basis does the exchange decide to move a particular scrip from regular trading to 'T 2 T'?

[ajay]

Check these links for detailed explanation of the process

http://www.bseindia.com/markets/equity/EQReports/sur_Price_monitoring.aspx?expandable=6

http://teluguinvestor.com/blog/equities/trade-to-trade-segment-stocks-selection/

[hpreddy]

Revision in Criteria for Shifting Scrips to/from Trade for Trade Segment, June 25, 2014

http://www.nseindia.com/content/circulars/SURV27012.pdf