sentences:  For example, although technological innovations are often developed in the oil & gas sector through oil exploration activities, these innovations are unaccounted for in innovation metrics because oil exploration is not counted as formal R&D.Other types of innovation, including social innovation, can be classed as hidden innovation.Although originally coined in the 90s by Diana Hicks and Sylvan Katz in their research on the hidden research system involving hospital researchers, and Mike Hopkins research on genetic testing within the UK healthcare system, the concept of hidden innovation has most recently been promoted by NESTA, in their "Innovation Gap" Report, published October 2006.