A strong-programme building is one in which numerous different categories of persons must all be brought into the same interface space in well-defined relations, and meanwhile, spatial configuration must ensure that each of these interfaces happens in exactly the right way and that all other possible encounters are excluded. The courthouse is a typical example. In contrast, a weak-programme building is one with a high degree of apparently random movement and static encounter generated by its spatial layout.
Hillier, B. (1996, 2007), Space is the Machine: A Configurational Theory of Architecture. Space Syntax: London, UK. p198-201