Most of the effort in the software business goes into the maintenance of code that already exists.

Writing software that's safe even in the presence of bugs makes the challenge even more interesting.

I was going to visit IBM for six months as a visiting scientist. Now, six months is a lot of time, so I came with a whole list of projects that I might want to work on.

Most of the effort in the software business goes into the maintenance of code that already exists.

Windows favors multi-threading, which means that a service is implemented by one single process.

However, writing software without defects is not sufficient. In my experience, it is at least as difficult to write software that is safe - that is, software that behaves reasonably under adverse conditions.

At the time the Sendmail program had a very poor reputation with respect to security, with four root vulnerabilities per year for two successive years.