Deciding the moment to end the lifecycle of an information system are often not exhaustively studied. It is essential for an organisation to know when to end the life cycle of their legacy information system when it is no longer able to perform and comply with the changes the organization desires. Prolonging the length of an information system lifecycle could lead to a reduction in software cost. Most of the various metrics presented in literatures on agility measurement, such as Cost, Time, Robustness and Scope of changes (CTRS) and Simplicity, Speed and Scope of changes (3S) and the researchers evaluation methods, e.g., Hierarchy Process (AHP) and Fuzzy Mathematics Analytic are qualitative and usually need to be evaluated by domain experts subjectively. This study therefore developed an enhanced agility assessment model to measure legacy information system quantitatively with the agility factors: Speed, Robustness and Complexity in an educational institution. The adoption of a quantitative metrics methodology will lead to an accurate measurement of the student information system. A stand-alone online assessment system based on agility factors and satisfying the maximum metrics benchmark requirements was used for the model implementation. The results were: Complexity of the largest module=96, Robustness=547.5 hours and Speed 0.5 minutes. The complexity of the module that exceeded 20 can be fixed by reducing the control constructs of the source code modules into submodules, with each not greater than 20. The results obtained indicated that the student information system was still agile. Thus, management should continue with the system.