In April 2013, SPIE sent email survey invitations to its global customer database. Response was voluntary and open. An iPad raffle and early access to this report were offered as incentives to encourage participation. Surveys were completed online using Vovici's enterprise survey tool. Results were filtered to yield 6,752 valid responses. Any response lacking salary data was removed, as were duplicates and responses from students, the part-time employed, and unemployed. Microsoft Excel and SPSS were utilized to create summary statistics and related disaggregations.