Several stability statistics can be used for evaluating the mean performance and stability of genotypes across a set of environments. Aiming at improving the R package 'metan' I would appreciate know from the community which are the most used stability methods, and if someone knows or use a method not yet implemented in open-source software. If you use R to compute stability statistics, what is the main difficulty you face? Which would you expect from an R package for multi-environment trial analysis?