18. Six Sigma
Six Sigma is a business methodology that uses data and analysis to improve business performance with the goal of eliminating mistakes, waste and rework, according to Global Knowledge. Certified professionals are paid well, with their value reflected in improved business performance.
The certification is unique in that there is no standard exam, Global Knowledge said, meaning that some organizations can certify an employee for simply taking a course or completing a project. Each candidate is required to have a leadership-approved project prior to certification training.
The entry-level Six Sigma Green Belt is held by 91 of 7,300 Americans and Canadians who responded to a Global Knowledge survey, and is reflected in an average annual salary of $103,701.