“Your assumptions are your windows on the world.
Scrub them off every once in a while, or the light won't come in.” – Isaac Asimov
Assumptions can be very useful things. After all, they only exist because they are often true and they make decision-making so much easier. But if the result of making the wrong assumption is costly – for example, causing a global assignment to fail – they are dangerous too.
As Isaac Asimov suggests, it is useful once in a while to examine those assumptions – in our case, the assumptions made when planning of global assignments. Get your cleaning cloths ready. It’s time to scrub the windows and let a little light in…