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All theories deal with ideal models, which refer to actual phenomena, by correspondence rules. These criteria are applied differently depending whether representational or phenomenological theories (the two are complementary). Phenomenological approach: is so called due to the proximity to the phenomena (pressure, volume); We get shallow explanations and predictions. The representational approach: in the hypothetical models, we use to represent structures and nonobservables processes, as for example the explosion; It increases the depth at the expense of safety. Early in discipline, they usually obtain phenomenological laws, that make possible the formulation of representational hypothesis. Knowledge has progressed thanks to representational hypothesis.

Not only wanted the certainty that can be achieved with the current means of observation. We formulate speculative guesses and are required to be verifiable empirically; ensuring reliability. Object of the theory phenomenological: is defined through observational concepts such as pressure, volume; the object of the representational theory is defined by unobservable, e.g. properties. subatomic particles. In any case to test the theories empirically, we use data from the experience. With regard to data, refers to the made manifest, something that is offered to us and cannot be manipulated. To obtain and interpret those results you must use theories.

The check is valid according to:-to obtain data must use longer accepted theories, rthe of what they are seeing. Experimental data have their own validity scope, and are open to new explanations and clarifications, constituting one of the traits to their reliability; allowing to reach valid knowledge without closing the doors to progress. What is the validity of statements? There are three types: 1 – observational statements; 2 experimental and law 3 – General principles. Observational statements, they express experimental (value of the temperature of a gas). The reliability of a discipline depends on its ability to establish these criteria with a solid foundation. From the logical point of view, the observational statements are assumptions, their validity is based on the reliability of the used techniques (electron microscope, detectors of particles, etc.) I invite you to visit the Digital Library of where you will find quality checked for your spiritual and personal development articles: labor output, computing, sports, health, languages, Dactilopintura, entertainment and more.

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