The RMi (rock mass index) system applies input of block size, joint characteristics and strength of intact rock to express the uniaxial compressive strength of a rock mass. From practical use in more than 5 years the RMi rock support method has been further developed. It is now more user-friendly and easier to learn. Preliminary support estimates can be made from input only of  block size and the size of the tunnel when only limited knowledge of the ground conditions is  available. Later, when more information of ground is available, more accurate support  estimates can be made.