Pharmaceutical products are grouped into categories in sales, medical, and promotional audits according to the EphMRA/PBIRG Anatomical Classification System. This classification enables the market researcher to analyze therapeutic markets and to compare similar products.

Crisell outlines the signs used in radio, necessarily auditory due to the format.  He palces special emphasis on words, sounds, music, and silence.  Relevance and symbolism shape the medium, with various signals to aid the listener in understanding the programming.