The heuristic evaluation method is one of the most reported methods in the literature to evaluate the usability of software products.However, despite its wide acceptance by the scientific community, there is not a formal framework that can guide step by step to the specialists on how to execute the entire evaluation process.The literature only provides general recommendations that were established by the original author of the technique.However, through an in-depth review of the recent studies which describe the use of this method in the context of software applications, we have developed an own proposal.The new approach consolidates several perspectives from different authors who have used the method in diverse domains.This paper is focused on the validation of our new protocol to conduct heuristic evaluations.For this purpose, an experimental case study was carried out in the Web domain with the participation of twenty postgraduate students.The results establish that more accurate results are obtained when a structured process is followed.