The parties are Zoram Nationalist Party (ZNP), Mizoram People's Conference (MPC) and the newly-formed Zoram Exodus Movement, ZEM convener K Sapdanga said today.
He said, they were also holding talks with non-political associations, comprising people who were dissatified with the ruling Congress government and the former Mizo National Front (MNF) rule.
"We have been holding talks with six groups and the final decision might be made by next week," he said.
He said, they wanted to build a Third Front for forming a non-Congress and non-MNF government in Mizoram.
While Mizoram, which became a union territory in 1972 and a full-fledged state in 1987, had a Congress government for over 20 years, the MNF had ruled the state for over 10 years.