Also in spring 564, the one major accomplishment of Emperor Wucheng's reign—a revision of Northern Wei's criminal code—was completed, allowing greater fairness in the application of laws. Further, Emperor Wucheng was interested in greater promulgation of the laws, and he ordered the children of officials' households to study them, leading to a wider base of legal knowledge than previously had been the case. He further formalized the tax code as well, not only trying to make the tax burden fairer, but also created a system where adults without land ownership were distributed lands to farm on, to encourage food production.