Small and Medium Enterprises (SME) comprise 99% of the European-economy, though, most research and implementation methods concerning Business Process Management Systems (BPMS) focus on large enterprises. We create a BPMS implementation method that is suitable for SMEs. Based on three existing BPMS implementation methods and by incorporating differentiators of SMEs and large enterprises a BPMS implementation method is constructed. The constructed method is validated through a series of interviews with BPMS implementation experts. Experts agree with the constructed method though discussion arise on a more detailed level of activities in the method.