Prime Minister Ariel Sharon apparently hasn’t shaken up Israeli politics enough in the past week: He is looking into changing the Israeli system of government in order to reduce the power of political parties. Sharon’s new party, Kadima, is expected to publish its platform this week. Meanwhile, sources within Labor said the Shimon Peres, the recently ousted head of the party, might join Kadima in the coming days. Labor Chairman Amir Peretz has not agreed to giving Peres a top spot in Labor. Sharon is likely to gain cabinet approval today to name members of his new party to replace Labor ministers who resigned last week. Sharon himself is expected to retain for his party the positions of interior minister and vice-premier.