Hello teachers

I need your help. Due to my new campus regulation which states that the students who want to conduct an action research must concern with micro skills; then,I have a plan conducting a research about listening, for this case I choose recognizing spoken words. However, I am still confused how to measure the recognizing words itself in order to know the improvement. Could you help me what indicators of recognizing words should I concern about? Then, what kind of tests are appropriate to know the students will succeed in recognizing words.

Thank you