 Budget limitations, market requirements and competition set constraints on the design process and comprise the non-technical influences on aircraft design along with environmental factors.Competition leads to companies striving for better efficiency in the design without compromising performance and incorporating new techniques and technology.In the 1950s and ’60s, unattainable project goals were regularly set, but then abandoned, whereas today troubled programs like the Boeing 787 and the Lockheed Martin F-35 have proven far more costly and complex to develop than expected.