Creative brains are a valuable, limited resource. They shouldn't be wasted on re-inventing the wheel when there are so many fascinating new problems waiting out there.
To behave like a hacker, you have to believe that the thinking time of other hackers is precious — so much so that it's almost a moral duty for you to share information, solve problems and then give the solutions away just so other hackers can solve new problems instead of having to perpetually re-address old ones.
if nobody can examine the code, how do we know this medical device is:
We Don't: "The Alchemist Says It Works"
if you want to improve something and have the skills, with OSS you can
if you want to improve something and don't have the skills, with OSS you can hire someone to do it
if you improve something, it can be shared with the community
and in return you get to share community developments too
clinicians not directly employed in software are more likely to contribute to an open source project than a closed source product
the NHS and OSS
NHS has an intrinsically Sharing philosophy
we share the risk of illness and derive protection from this
we share medical knowledge (eg journals, conferences)
we share organisational knowledge (eg networks)
NHS staff readily comprehend the idea and benefits of OSS
Microsoft ports .NET to Linux and Macintosh and open-sources the entire stack