NEW DELHI: Sixteen opposition parties today urged the Election Commission to revert to the paper ballot system, claiming the faith of the people in the EVMs has "eroded".Representatives of parties including Congress, BSP, DMK, Trinamool Congress and the Left met top EC officials to demand reintroduction of the ballot paper system.The poll watchdog, which has vouched for the reliability of EVMs, said it would soon convene an all-party meet to discuss the issue, senior Congress leader Kapil Sibal and DMK leader T Siva told reporters after the meeting.