Architecture Design 8 (2011), we were given 4 strategies namely Flexible, Mobile, Distributed and Virtual. From this we are limited to these four approaches but have the freedom or to simply put, randomization of ideas regarding these 4 approaches. There are many different definitions or interpretations for each of these words. If you draw a circle domain for each of these 'idea' we will end up with something like 4 circles of domains interlocking with similarities and differences in between each of them. But this is just my individual interpretation of the idea.
Flexibility, not just in terms of architecture but in a much broader sense. Something that can be bent, shaped, altered, adapted, changed, evolved, moved, universal etc.
Distributed, something that can be duplicated, multiplied, copied, delivered to different locations, none fixed site, a network of inter-communication system, linkage of things, people & information etc.
Mobile, something that can be moved with requirement or needs, ability to move people or things, ability to move environments (passengers perspective), easement of no permanent location or site etc.
Virtual, is a very unfamiliar concept or an idea quite difficult to digest. In my perspective and understanding, it could be something that is communicative, representative, visual effects, an invisible or illusive interpretation of something.