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.
Because operational testing will assess the ability of the system(s) to meet the production threshold values as defined by the KPPs, Key System Attributes (KSAs), and other performance attributes, these attributes must be testable.