This report outlines Forrester's guidance for developing a business case to justify a BYOD program to support your workforce computing strategy. Supporting the growing number and increasing diversity of mobile devices used for work is particularly challenging for I&O executives. Results of Forrester's Forrsights Workforce Employee Survey, Q2 2012 show that more than two-thirds of North American and European information workers personally choose the smartphones and tablets they use for work, and that 46% of employees personally choose work laptops that are not on the company-approved device list. To address this trend, I&O professionals are developing BYOD programs to support smartphones, tablets, laptops, and desktops. Justifying the ongoing investment in these programs requires I&O execs to capture the comprehensive costs, benefits, and impacts of BYOD program implementation across the corporation. Although many I&O pros are currently developing BYOD programs, our interviews with I&O execs indicate that often they have not captured the end-to-end benefits, costs, and impacts. This report contains a comprehensive list of benefits and costs associated with deploying a BYOD program and highlights examples of the positive impacts your BYOD program can have throughout the organization.