Several methods allow measuring the degree of usability of a software product. The heuristic evaluation is one of the most popular methods which allow finding more usability problems, in comparison to other methods. However, sets of generic usability heuristics may not evaluate (usability) aspects related to specific software. A set of usability heuristics for Grid Computing was developed using the methodology proposed by Rusu and others, in 2011. The methodology facilitated the heuristics’ design and specification, with stages that support the developing process and allow to formally specifying the heuristics. The paper highlights certain deficiencies detected when applying this methodology and suggests some improvements.