In a knowledge generation process, not only the design of the instruments that allow obtaining the data to comply with the objectives of any investigation is important, but it is vital that these instruments are validated so that the final result of the interpretation of the results provide greater confidence in the conclusions, granting scientific validity to the study. Care must be taken in relation to ethical treatment in the field work of research, for which the existence of an Ethics Committee is of the utmost importance since, among other actions, it contributes to the protection of the rights of individuals and of the communities participating in the research project, ensuring the respect and care of people, living beings and the environment, which is part of the research. The nature of the research was qualitative, non-experimental, descriptive, transeccional design. The way in which the information was collected for the research was bibliographic. As a result it will be mentioned that it is necessary to consider that the field work requires trust, patience and security in the acceptance of the participants, capacity of adaptation and acceptance of the facts, versatility, to obtain the necessary data, persistence in the comparison of the data obtained and decision to overcome the confusion. It is vital that the instruments designed are properly validated to give scientific certainty to the results obtained.