Manuscript and corrected typescript versions of Strachey's 'Preliminary Report on the Choice of an Order Code for the D.D.P.', June, 'Supplementary report on the Choice of an Order Code for the D.D.P.', July-August, and 'Final Report on the Choice of an Order Code for the D.D.P.'

Strachey acted as consultant on the design of a digital data processor (D.D.P.) for the firm.