Any company wishing to implement a Lean approach is faced with the following issue: should Lean be implemented sequentially or simultaneously? No consensus on the method for implementing Lean has been established. For this reason we sought to find out if there was an implementation order regarding Lean practices. 25 Lean experts were interviewed. We used a precedence method to identify the potential precedence for implementing certain Lean practices. We considered only the common responses from over 50% of Lean experts interviewed. We showed that five precedence levels could exist. Understanding these levels should contribute to the creation of a deployment standard for Lean, as well as the successful implementation of Lean practices in companies.