The purpose of this article is to investigate the understanding on the workers of mission in ecumenical theology. Since mission is an action for the Kingdom of God, it is important to understand who is in charge of this work for an effective ministry. In the past, the church thought that the major agents of mission are ‘the church’ or ‘the chosen people.’ However, after the second world war, the ecumenical theology started to see the worker of mission more in a wider view including various organizations in the world. In this paper, first I tried to find out from what motivation the new view came out. They were the following perceptions: 1) the church realized that the church, the major agent of mission, committed serious sins especially during the two world wars, 2) due to the impact of Missio Dei, the church came to see that the workers of mission are not just the church but also many other institutions in the world, 3) the church came to change its view on the world from a target of mission to a coworker of mission. With this kind of background, the ecumenical theology tends to see the workers of mission as the triune God himself, the various institutions in the world used by God, lay people, and the poors. This kind of understanding contains various strengths and weaknesses. It might be helpful for the church to break its arrogance and self-centered attitude. Also it can help the church to cooperate with the world in carrying out the mission, and to keep going forward toward the ideal direction of mission. However, this view contains some weaknesses as well. As it emphasizes God as the major worker of mission too much, it can reduce the church's responsibility and enthusiasm for mission. As it pursues cooperation with the world, it can bring a result of weakening the identity of the church also. As it includes the world, which is not concerned and interested about God, as a major worker of mission, the church can fall into a trap of idealism and as a result of this it can cause enfeeblement of mission. If these kinds of weaknesses are compensated properly, the ecumenical view on the workers of mission would be helpful for building up the church for world mission.

When we carry out a work or project, setting a clear goal is crucial for a success of the vocation. A goal means a task, target, or place to go or to achieve, and in this sense, a project whose goal is not clear enough cannot be achieved successfully. Since mission is also a ministry of a religion, making a clear goal is important for its success. However, in Christian mission the goal of mission is understood in various ways. While in the traditional view the understanding of mission’s goal is rather simple and clear, recent view is rather inclusive and complicated. In particular, the ecumenical view of the goal is quite different from that of the traditional view. So this article investigated the goal of mission in ecumenical view with a desire to provide a foundation for making a desirable purpose of mission today when the Christianity is in a deep crisis. For this purpose this article studied some major goals of ecumenical missiology such as humanization, JPIC, unity and reconciliation. As a result of this investigation this paper suggested some major characteristics of ecumenical goal of mission: broad inclusiveness, deep concern on the transformation of the world, high possibility of change, and removing priority. These kinds of characteristics have various strengths and advantages in serving and transforming the world, and in making suitable goals which fit the felt needs of the changing world. In other words, the ecumenical goals are effective in serving the world. However, the ecumenical goals have some limitations as well. The goals of the ecumenical wing are so broad and inclusive that the energy would be divided into many directions. Some goals are agendas of the world which seek welfare of the world, so these goals are helpful for the development of the world but not much for growth of the church, a major goal of mission. If ecumenical goals are compensated in these areas, the goals would be much more effective for the Kingdom of God.