Six Sigma certifications are intended to demonstrate that you have the capability of handling complex projects and the problems that may arise while working on them. Through my company I recently registered for lean six sigma yellow belt course, and based off the overview of the course it deals with waste reduction and time management in better completing projects. After completing the course we are required to take on a project within the company and if successfully completed we would be certified in yellow belt. As you move up the ladder there are more complex techniques, as yellow belt only demonstrates awareness of the core principles. There are also written tests associated with the other certifications and overall it is a good idea to go through the training, however not all companies do utilize or require this process. In my opinion it is good to have as you learn different techniques that are utilized within industry and it can be advantage when applying for different positions.