Missiology investigates the mandate, message, and mission of the Christian church; especially missionary work. It is a multi-disciplinary and cross-cultural field of study incorporating theology, anthropology, history, geography, theories and methods of communication, comparative religion, Christian apologetics, methodology, and interdenominational relations.
Today some missiologists are disavowing colonial methods and attempting to construct a new paradigm that does not employ such imperialistic approaches which lead to language and cultural imposition.
Also - one goal of missiology is to distinguish between practices that are essential to Christianity which must be practiced by Christians in all cultures, and other strictly cultural expressions of Christianity that can vary between societies while still expressing the Christian faith.
From: Evangelical Dictionary of Theology. 2001. 780-83
Contemporary Missiology: An Introduction. 1978. 5
Post Christendom: Church and Mission in a Strangle Land 2004. 83-88.
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"Go, therefore, make disciples of all nations; baptise them in the name of the Father and of the Son and of the Holy Spirit, and teach them to observe all the commands I gave you. And look, I am with you always; yes, to the end of time."
New Jerusalem Bible