There is no doubt that education plays a major role in the salary a CSI can earn. Each step up the ladder provides an increase in potential income. First comes the high school diploma. Second would be an Associate of Arts degree or a degree in a technical discipline. Third would be a Bachelor of Science or Bachelor of Arts degree. Forth would be a Masters degree. Finally, A PhD will complete the educational ladder insuring that you can maximize your earnings potential. Beyond this, specialized training in any of hundreds of disciplines will continue to increase your value to your employer.