Stafford Beer’s Viable System Model is the best known of the many cybernetic models he constructed over a career spanning more than 50 years.
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viability | BrE ˌvʌɪəˈbɪlɪti, AmE ˌvaɪəˈbɪlədi | noun, no pl. 1 (of fetus, animal, plant) Lebensfähigkeit (Fem.) (of seed) Keimfähigkeit (Fem.) 2 (figurative) (of state, company) Lebensfähigkeit (Fem.) (feasibility) Realisierbarkeit (Fem.)