The present study suggests the use of a fuzzy inference system (FIS) model to assess the leadership skills of secondary school principals. To assess the principals’ leadership skills, teachers’ perceptions of these skills concerning various items are collected by using a five-point Likert scale. Further, these values are categorized into linguistic variables that are used as input in a fuzzy inference system to get an overall principal leadership skills score. The implementation of our model for a secondary school in Pakistan highlighted weaknesses in leadership skills, which may need suitable planning to enhance these skills. This FIS model acts as a device to help the policymakers in judging several components of leadership in those institutes in which they are serving. This study implies that school principals would be more effective if they possess leadership skills. The skills would enable them to turn schools into effective schools