4. Methodological procedures This study seeks to raise the practical importance for Brazilian manufacturing and service companies of the various operations management themes, trying to identify differences in their needs, based on the requirements described in job vacancy ads. Similar methodology has been applied by other researchers in other areas. Faria et al (2015) collected information on professional placement websites in order to identify the market requirements for logistics professionals. Peleias et al. (2008) carried out the identification and analysis of the professional profile required by the labor market for Accounting Professionals in Sao Paulo, based on their evaluation of 2,560 job ads published in local newspapers. Azevedo and Gomes (2006) studied the labor market for information management professionals in the context of Brazilian companies in the country's North, Northeast and Midwest, by analyzing 578 job advertisements on the Catho website (www.catho.com.br). At the international level, Rieucau (2015) compared recruitment practices adopted by retailers in France and the UK, based on the analysis of the content of vacancy ads on websites. The sample consisted of 454 French company announcements and 329 advertisements from UK companies. Glazer and Hassin (2010) studied the effectiveness of job posting ads on websites. Choi and Rasmussen (2009) assessed the most important qualifications and skills required for the position of digital librarian by analyzing 363 job postings. As can be seen, collecting data from job posting ads published by online agencies have become a data source option for researchers working in diverse areas. Job posting sites have revolutionized the way companies connect with individuals seeking employment. According to Silveira (2004), the internet has become an important means of advertising job offers, because it functions as a mass communication media, like the press, radio and television, which employers have always widely used to disseminate job vacancies. However, the internet is much more effective than these other approaches, as they do not allow for the same degree of interaction among the parties. Another factor that contributes to the use of the internet by both prospective employees and employers is the volume of information provided and shared, free of charge, which is infinitely higher than that possible through traditional communication channels (Silveira, 2004). 1.1 Choice of recruitment websites to be assessed In order to analyze the vacancies offered, we chose companies specializing in recruitment and selection services, which disseminate job vacancies through web classifieds. We only considered websites that operated at the national level, offering job placements in the different regions of the country, as we sought to understand the phenomenon in Brazil as a whole and not in a specific sub-region. The fact that the internet does not impose geographical barriers does not necessarily mean that a company operates in a broad