The purpose of this study was to theoretically and empirically identify essential characteristics for a professional development program that promotes the acquisition of teachers’ competences involved in the implementation of an ASMaT module. A 3-step approach was used to identify the essential characteristics: (1) evidence produced in the classroom settings of the schools; (2) specific curriculum features of the ASMaT subject were taken into account; and (3) evidence generated by curriculum implementation literature pertaining to effective characteristics of implementing an innovation. Five characteristics were identified as essential characteristics that should be incorporated into a professional development program.