Dehydration will cause your skin to be dry and flaky and itches , just like what we call winter skin, and can also cause your sips to be very dry, chapped and red from the dryness, but the way you describe your symptoms, you have something systemic going on,, like an allergy.
Operating Standards are a set of guidelines or regulations that people have to meet or exceed while in operation. It makes sure that the product that they produce is of acceptable quality for consumption by the public.
An operational definition is a demonstration of a process-such as a variable, term, or object-relative in terms of the specific process or set of validation tests used to determine its presence and quantity. simple example that shows the relationship between a conceptual definition and an operational definition: if the concept is weight, an operational definition could be the weight of an object as measured on a scale.