Fields of Anthropology. There are now four major fields of anthropology: biological anthropology, cultural anthropology, linguistic anthropology, and archaeology. Each focuses on a different set of research interests and generally uses different research techniques.
SPC is one of the three categories of Statistical Quality Control (SQC). SQC is a statistical method of analyzing variations in the manufacturing process in order to make it better and more effective. Only a certain number of samples are needed to determine whether the products are acceptable.
Continuous Tone Coded Squelch System (CTCSS) is a feature in most conventional analog radios, using sub-audible tones to allow multiple groups of users to communicate on the same frequency (channel) without receiving radio traffic from each other; and to improve radio operation in high RF noise, interference and congested areas.