Here's a very brief overview of church history, engagingly presented by Dr. Patrick Keifert, that focuses on missional church issues.
From Craig Van Gelder's book The Ministry of the Missional Church: A Community Led by the Spirit:
The church is.
The church does what it is.
The church organizes what it does.
The interrelationship of all three aspects is important to understand. The church is. The church's nature provides the framework and foundation for understanding the essential character of the church. The church does what it is. The nature of the church establishes the foundation for understanding the purpose of the church …
By Mary Sue Dreier
Missio Dei (Latin for "mission of God") has become one of the catchphrases of the missional church conversation. The phrase itself has a story to tell which illustrates the insights, importance, and implications it has for our future as a church in mission.
Missio Dei was coined to express the essence of the conversation when Christian churches from around the world gathered in 1952 in post-World War II Germany (Willingen) for an international council on mission. The twentieth …