In Malawi, over 50,000 tonnes of sweetpotato are produced annually and each district has a certain level of sweetpotato production. However, it is not clear how much OFSP is produced. Out of that produced, it is assumed that majority of it is Zondeni. To better estimate the yield, the mother-baby trial approach is being used. This is a simple design developed in the late 1990’s in Malawi by Sieg Gassman of ICRISAT. The presentation describes the process and experience of using the mother-baby trial approach.