The Ninety-Ninety Rule of Project Schedules - the first ninety percent of the task takes ninety percent of the time, and the last ten percent takes the other ninety percent.

He has also written a self-help satire called Healing Yourself with Wishful Thinking. Arthur Bloch (born 1948) is an American writer author of the Murphy's Law books. Since 1986 he has been the producer/director of the Thinking Allowed PBS television series.

The word 'Wrong' is printed upside-down on the book's cover (for obvious reasons). He has also written a self-help satire called Healing Yourself with Wishful Thinking. This was the first of many Murphy's Law books.