3G Disciple Making
3G Disciple Making is training/coaching your disciple to make 3 generations of disciples.
Just as Paul taught his Timothy, so you are training your disciples to teach their "Timothy's" to do 2 Timothy 2:2:
You have heard me teach things
that have been confirmed by many reliable witnesses.
Now teach these truths to other trustworthy people 
who will be able to pass them on to others.  2 Timothy 2:2 NLT

For example, let's say you are discipling (training/coaching) Chuck to do 2 Timothy 2:2 with Chuck's disciple Mark.


(1) you = Mark (first generation of Chuck)

(2) me = Chuck
(3) trustworthy people = The second generation of Chuck.
(4) others = The third generation of Chuck.  This 3rd generation is what "3G" refers to.
This typically takes 1-3 years of intense one on one discipling training.