This document provides a literature review on the effectiveness of MOOCs for professional development. It discusses how early MOOCs aimed to provide college level courses to students worldwide but completion rates were low. Now, MOOCs are increasingly being used for corporate training and professional development. While some employers view MOOCs favorably, there is limited data on their quality and effectiveness for employee skills and performance gains. Some companies have partnered with MOOC providers to create degree and credential programs, but it remains unclear if MOOCs will be widely accepted as a learning tool for employee development.