Answer:
The correct answer is Experimentation.
Step-by-step explanation:
Experimentation, a common method of experimental sciences and technologies, consists in the study of a phenomenon, usually reproduced in a laboratory, in the particular conditions of study that interest, eliminating or introducing those variables that may influence it. Variable or constantly changing means everything that may cause changes in the products of an experiment and distinguishes between a single, joint or microscopic variable.
The particular property of the definition is "controlled." The independent variable is an event that is incorporated into the experiment and we want to see how it influences the dependent variable, which is not submitted; They call it experimental and control. The characteristic is measured before and after the event. A longitudinal study with a panel, which is a group of people representative of the habitat and of adequate sample size, to which a questionnaire is applied in continuous time periods, is an experiment controlled by the variables studied: changes in the shopping habits, evolution of human values, influences of social change, impact of information, etc.