But CBS shares have outperformed those of Viacom over the last five years. According to the Reuters report, Shari Redstone, Sumner's daughter and an owner of National Amusements, has favoured recombining CBS and Viacom under the leadership of CBS Chief Executive Officer Leslie Moonves. But for a deal to happen, the Redstones will have to assure Moonves he will have full autonomy over the combined entity, Reuters said basing their observations on unnamed sources. Industry speculation that the two companies might come together again increased in recent weeks after the Redstones prevailed over a power struggle that resulted in the departure of Viacom Chief Executive Officer Philippe Dauman. CBS's management and independent directors "will take appropriate actions to evaluate what is in the best interest of the company and its shareholders," a representative told Reuters. Viacom said it expected its board to form a special committee of independent directors to consider this offer.