Decade-old surveillance norms in the capital markets has been revamped. Securities and Exchange Board of India, the Bombay Stock Exchange and National Stock Exchange today revised the criteria on decision on securities to be put under the restricted trading category.As per the new norms, the capital market watchdog and the bourses will review the shifting of scrips into and out of trade-for-trade segment on monthly basis as against the current practice of doing it every fortnight. This segment category are reviewed as part of surveillance action to ensure market safety and safeguard investors' interest.These measures are taken after joint consultation between SEBI and the Stock exchanges.