It is different because it is possibly the only publicly available method that covers all aspects of system development from project inception through to support and maintenance.
Ni tofauti kwa sababu ni uwezekano hadharani mbinu pekee ambayo inashughulikia masuala yote ya maendeleo ya mfumo kutokana na mradi kuanzishwa kupitia kwa msaada na matengenezo.