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Best data collection methods for research The best data collection methods for research are very important. An investigation is scientifically valid when it is supported by verifiable information, which answers what is intended to be demonstrated with the formulated hypothesis. To do this, it is essential to carry out a data collection process in a planned manner and with clear objectives regarding the level and depth of the information to be collected. This article presents a series of criteria to consider when designing the information collection tool, as well as the collection methods to achieve reliable results in an investigation. Statistical units or individuals are called the component elements of the population studied. The population can be a group of human persons: the staff of a company, the students of a teaching center, the Inhabitants of Spain on December 26, 1996 or a group of objects, the production of a workshop, the Spanish automobile fleet  set of in...