The region of Najdi in Central Arabia is the centre of a purely Arabian culture based on a partnership between Bedouin camel husbandry and settled palm cultivation. Because of its isolated position the Najdi dialect is of a very interesting and conservative type showing very little non-Arabic influence, which has led to the reputation of the Arabian Bedouin as preservers of the original Classical form and considerable prestige being attached to the Najdi type. Ingham's work concentrates on the grammatical system, syntax and usage and is based on a number of trips to the region over the last fifteen years. The data base includes Bedouin oral narrative, ordinary conversation and radio plays.