Evangelism, Apologetics and Missions

Why connect these three and how are they differentiated? The question was asked by a dear friend I told about this blog site. So, it seemed to be a sensible thing to deal with in a posting.

First - how differentiated
By evangelism I mean the two alternatives of "witnessing" ('being ready with an answer for the hope that is in you' of  I Peter 3:15b) about and "heralding" (or "proclaiming" as in Mark 1:45a) the Gospel. The difference between the two activities (it seems to me) is that one is responsive and the other initiative.
A witness answers questions about what they know or have experienced (as did the blind man whom Jesus healed before the Scribes and Pharisees) and a herald proclaims what has been given him to speak by the king (so is more akin to preaching). Both activities are considered to be a part of evangelism even though the methods used are different.
By missions I mean the same initial activity but the purpose of missionary work is the establishment of new congregations and is usually undertaken at the behest of a local congregation (or group of them). This will require more than just evangelism, it requires teaching and training the new members to be able to undertake the task of ministering to the needs of those about them, it requires encouraging the development of the structure of a Church (including the calling of and choice of elders and deacons), it requires the institution of the sacraments and beginning discussions with a Church body which will likely link the new congregation with other like-minded Christians in the nation or around the world. This work is designated in the New Testament as that of the Apostle (or "sent one" in Greek - the Latin verb for the same concept is "missio" - hence missions).
By apologetics I mean the disciplined discussion of the tenets of the Christian faith whereby a reasoned, logical, defence of the faith is provided to show that our beliefs are based on solid reality and that we do not follow cunningly devised fables. Generally the only difference between evangelism and apologetics is that the latter often takes place in a more formal setting. Missions may also include the necessity to be involved now and again in apologetics. Paul's discourse on Mars Hill in Athens (recorded in Acts:17:16-34) certainly gives an example of this kind of activity.

Second - how connected
Having explained how each is different from the other it should also be apparent why I have connected them here. I don't plan on limiting myself to content of each or just "how to"  postings. For, as you think about Missions, for example, it is apparent that many more subjects need to be included under this umbrella. The general focus, however, will be speaking about spreading the Gospel of Jesus Christ.