A effictive leader is considered to be a person who is passionate enough to inspire his soldiers' capability, and he can make people cooperate with each other effictively. Meanwhile the ability of fixing complex situation is necessary to a leader.I don't approve that all members should participate in making decision. When everyone in a group joins into a decision, it sure will decline the effictiveness of  the decision and fold increase the time it takes. On one hand, everyone has a his own opinion about the optimal choice which may not be all the same. Strong argues may emerge in the value difference, and lead to an chaotic result. On the other hand. A choice is welcome when it involves the benefits of all members, but not all members have to participate in it.Just like the board of a company which make important decisions only consists of a few people. Even the  most successful enterprise runs in this way. What is important, a good leader concerns not only himself but also his men when  makes an optimal dicision. Meanwhile, members will work effectively if the reward system is  resonable, and what leaders should do is to formulate a effictive managment system.There is some truth in the viewpoint which others join in the dicision progress. As we can imgine, people will be harder working when he can feel himself like a owner of this company. He would probably be willing to spend more time on his job to amplify his interests. However, we need a few influential leaders to make most of decisions in a big company or group to keep efficient instead of massive meaningless arguements.