These recommendations formed the basis of the 'Extensions to the IPA' ('extIPA' for short, pronounced [ɛkˈstaɪpə] on the model of "JIPA" [ˈdʒaɪpə]) [...] While the extIPA symbols were drawn up mainly to aid those working within clinical phonetics and speech pathology, there is, of course, no reason why phoneticians working on non-disordered speech should not adopt some of the conventions introduced in extIPA. 1993, Martin J. Ball, “Further to Articulatory Force and the IPA Revisions”, in Journal of the International Phonetic Association, volume 23, number 1, →DOI, →JSTOR, pages 39, 41: