Online research reports 2,4 billion of daily conversations online, that involve a brand (Thelwall & Kousha, 2015), and those comments take place whatever the brand are agree or disagree. The online post between consumers is known as the Word of Mouth electronic (eWOM). EWOM was defined by Henning-Thurau, T., Gwinner, K., Walsh, G. and Gremler, D. on 2004 as “any positive sentence or comments realized by a potential, current or previous consumer, over a product or company, which is attainable to navigators by internet”. This research will expose the key factors of eWOM posted on portals for booking online like TripAdvisor, on the consumer making-decision process. Examining the eWOM qualitatively with lexical analysis software we discover these key factors. Finally, an experiment will be performance for discover how the factors effects on the consumer making-decision process, when the booking online could take place. The first stage is a qualitative lexical analysis with software Alceste. For the second, an experiment will be performance, for understand how the key factors of eWOM can affect the voyagers on the process of make a booking online for a hotel for they dream vacations. Qualitative research for eWOM has not been taken for researches so often, there is a gap on these investigation, especially for lexical analysis. The hospitality market could take advantages of this type of research, because eWOM can be measured for predict the rise of booking online for the future, on the hospitality management.