Abstract: Systems, methods, and computer program products for adjusting readability of reading material to a target readability level are disclosed. According to one aspect, a method includes receiving reading material and a target readability level. First and second readability measures associated with the reading material can be determined. The method can also include determining a target value corresponding to at least one of the first or second readability measure. The target value determination can be based on the target readability level and the other of the first and second readability measures. A parameter or portion of the reading material can be identified that is associated with the first or second readability measure and that has an actual readability value with a predetermined relationship with the target value.