George Terry has an article worth reading. His topic helpfully evaluates a popular training method that is especially popular in countries outside the USA.
‘This article analyzes the theological premises of the popular T4T [training for trainers] model for evangelism and discipleship. The analysis argues that the T4T scheme largely depends on several false dichotomies that do not engage the Scriptures except in order to proof text and it regularly excludes the middle area that conveys the biblical balance. The result is an overly rigid methodology that undervalues the influence of context in cross-cultural communication. Rather than a theological vision that holds in biblical tension both truth and context, T4T sanctions an inflexible evangelism scheme that is more conducive to receptive audiences and a discipleship model that is more conversant with what is expedient than what is biblical.’
Terry, George A. “A Missiology of Excluded Middles: An Analysis of the T4T Scheme for Evangelism and Discipleship.” Themelios 42, no. 2 (2017): 335-352.
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