This study aimed to explore how the leader power is affecting the performance
of beef farmer group. The research was undertaken in two farmers group in Kabupaten
Banjarnegara, Central Java Province involving 35 farmers and two beef traders.
Systems thinking the approach was chosen about its capability to capture the complexity
of the beef farming systems. A combination of semi-structured interviews, in-depth
interviews, and workshop have been conducted to finalize this study. The discussion
were focused on three aspects; (1) daily activities; (2) resources used and affected by
those activities; and (3) pressures that are directly affected the resources and activities.
The result was presented in a Causal Loop Diagram (CLD) which generated using
Vensim® software. The CLD showed that leader power affects the group performance
in two reinforcing loops. Firstly, leader power positively linked to the decision for
allocating profit to group reinvestment. Secondly, for allocating proportion for
breeding. Farmer’s actual income become the leverage of the power dimension. Income
will enforce the power thus makes the loop virtuous, whereas a loss will reduce power
and makes the power loop vicious