We intend to do research in East Africa to determine the impact of new tools to support farmers of a certain size, using for example mobile telephones or internet. we intend to use propensity score matching, a statistical matching technique (Wikipedia) that attempts to estimate the effect of an intervention by accounting for the covariates that predict receiving the treatment. PSM attempts to reduce the bias due to confounding variables that could be found in an estimate of the treatment effect obtained from simply comparing outcomes among units that received the treatment versus those that did not.