Abstract: Described herein is a system and method for automatically evaluating and providing feedback on code submissions. For example, when a code submission is received, the system described herein is configured to find closely related operable code submissions and compute corresponding expression discrepancies between the submitted code and operable and well-styled code submissions. The system then computes a minimal set of possible changes from the discrepancies to correct or improve the code submission. The changes can then be displayed and/or otherwise provided to the user or student who submitted the original code.