"It can be applied to many human endeavours, denoting a principle of action having speed or economy and purpose or utility. Basically it involves using an available system or dealing with an existing situation in a new way to solve a problem quickly and effectively. It is a method of creation relying particularly on resources which are already at hand."(Source: http://www.treehugger.com/slideshows/sustainable-product-design/adhocism-the-case-for-improvisation/?page=1)
