Question Answering in STACK Applying String Similarity.

We present a method to evaluate fill-in-the-blank student answers in STACK using a string metric, which is not possible in the current version of STACK. To increase the quality of the evaluation, we use whitelist and blacklist instead of a single teacher answer. The performance of a STACK question equipped with a string metric is quantitatively demonstrated by evaluating its use in mathematics courses. [ABSTRACT FROM AUTHOR]