General Andre Beaufre wrote in 1963 that strategic thinking "is a mental process, at once abstract and rational, which must be capable of synthesizing both psychological and material data. The strategist must have a great capacity for both analysis and synthesis; analysis is necessary to assemble the data on which he makes his diagnosis, synthesis in order to produce from these data the diagnosis itself—and the diagnosis in fact amounts to a choice between alternative courses of action."[16]