Since 2012, GFRAS has engaged in the process of developing the New Extensionist concept and subsequently the development of the New Extensionist Learning Kit (widely known as NELK).  Between 2015 and 2021 GFRAS developed the New Extensionist Learning Kit (NELK) with 20 modules. This package is meant for self-learning as well as interactive group learning. The content of NELK modules is therefore designed to be general enough (with global perspective) to allow customization to the local or regional context. Based on the demand from various organisations, experts in the GFRAS community have delivered and supported the training of RAS stakeholders with the NELK package in several countries. Experience has shown that the use of NELK was most effective if the content was adapted to local specific conditions and realities. This customization has so far been carried out in a case-by-case basis in various countries and regions. This document draws on the experiences generated so far, consolidates and provides a set of customization guidelines that are useful for people interested in capacity strengthening through NELK to make it suitable for their specific working environment.