There are several procedures for applying Lean approach in order to improve business processes in different sectors. However, these procedures seem difficult to apprehend by the practitioners and do not allow them to realize all the desired objectives through business process improvement. This paper highlights the need to analyze and classify Lean implementation procedures in the literature to provide business process managers with the trends in procedures to implement Lean and improve business processes. In order to achieve this goal, a review of literature of Lean implementation procedures is established, then a classification of the procedures selected is proposed and finally, an analysis of these selected procedures is elaborated. This paper concludes that Tool-oriented procedures and hybrid procedures are the most adopted in all sectors and hybrid procedures that rely on tools, principles, and objectives contribute significantly to achieving the goals targeted by the business process manager.