I think it was one of the long projects where the requirements – stuff that the customer or client wants the product to have – kept on coming in, and they kept on changing their minds, so the time dragged on and on with no end in sight, that was hard since we had to re-do some of our work which wasn’t nice at all!
Designing the radiometer I’m currently building for a satellite. It had a million requirements – focus light, two images, smaller than a matchbox etc. etc.
There was blood, there was sweat and there were tears – not all in that order and not necessarily all mine, either. But now it’s being patented and we get to call ourselves inventors – how cool is that!