The aim of this paper is to analyze the key features of an effective complaint management process as well as to explore whether these systems are formally constituted in terms of standards or other models for complaints management. We use four case studies of spa organizations from Spain. The case studies illustrate the organizations' approach to managing complaints and customer satisfaction effectively. The results of this exploratory study show that all four organizations have some mechanisms implemented to handle complaints although different levels of formalization have been achieved. The analysis unveils some common difficulties and key success factors of implementing a complaints handling system. The results of this paper suggest that...