Reverse engineering is widely used to acquire defence technology relatively quickly. However, this process carries the risk of creating uncertainty, leading to significant investments if the process is not controlled. A technology readiness level (TRL) calculator has been used to control the process of technology mastery during forward engineering. This study aims to build an additional model so that TRL can also be used to control risk in the process of mastering technology. It does this by using reverse engineering to help organisations reduce costs. This additional model is presented through a reverse engineering concept based on theory and is tested through a case study of a defence organization in Indonesia. The results of the case study show that the TRL calculator can be used as a reference in mastering technology through reverse engineering.

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