Steve McConnell, author of Rapid Development and other great books on software engineering, has updated his list of software's classic mistakes.

If you follow the link to the Construx site, Steve has a summary and links to more resources, but you'll need to register for the extra stuff.

Looking at the list, we find some old favorites at the top:

1. Overly optimistic schedules
2. Urealistic expectations

But two new items have joined the fun this year:

1. Confusing estimates with targets
2. Excessive multi-tasking