This chapter considers how evidence-based policing (EBP) might evolve to truly enhance policing. It outlines a roadmap towards an inclusive definition of evidence and EBP. The chapter focuses on why we feel a recasting of EBP is needed. One putative solution to the problem of police demand diversification is professionalisation. Among other things, the ambition of the professionalisation agenda is to equip police officers with greater knowledge and critical thinking skills so that they might perform their jobs more effectively and efficiently. The chapter proposes alternative ways of thinking about evidence generation and about how we might integrate that evidence into improved police practice. It suggests that the distinction is similarly relevant in policing. Studies documenting police practices and processes can contribute to revealing the distinctions between effectiveness and efficacy.