W. Va. Code § 11-15-9b
(b) For purposes of this article:
(1) "Directly used or consumed in the activity of research and development" means used or consumed in those activities or operations which constitute an integral and essential part of research and development, as contrasted with and distinguished from those activities or operations which are simply incidental, convenient or remote to research and development.
(A) Uses of property or consumption of services which constitute direct use or consumption in the activity of research and development include only:
(B) Uses of property or services which do not constitute direct use or consumption in the activity of research and development include, but are not limited to:
(2) "Research and development" means systematic scientific, engineering or technological study and investigation in a field of knowledge in the physical, computer or software sciences, often involving the formulation of hypotheses and experimentation, for the purpose of revealing new facts, theories or principles, or increasing scientific knowledge, which may reveal the basis for new or enhanced products, equipment or manufacturing processes. Research and development includes, but is not limited to, design, refinement and testing of prototypes of new or improved products, or design, refinement and testing of manufacturing processes before commercial sales relating thereto have begun. For purposes of this section commercial sales include, but are not limited to, sales of prototypes or sales for market testing.
(A) Research and development does not include: