If project content is allowed to change freely, the rate of change will exceed the rate of progress.

Related:

• Projects progress quickly until they become 90% complete,
  then they remain at 90% complete forever. -- Laws...
• The project engineer will change the design to suit
  the state-of-the-art...
• No major project is ever installed on time, within budgets,
  with the same staff that started it. Yours will not...
• The master programmer moves from program to program without fear.
  No change in management can harm him. He will not be...
• The master programmer moves from program to program without fear.
  No change in management can harm him. He will not...
• No system is ever completely debugged. Attempts to debug a system inevitably introduce new bugs that are even harder to find.
  Laws of Project Management...
• Change is not progress. -
  H.L....
• How many software engineers -- does it take to change a light bulb?
  Two. One always leaves in the middle of the project...
• Laws of Computerdom According to Golub 1) Fuzzy project objectives are used to avoid the embarrassment of estimating the corresponding costs.
  2) A carelessly planned project takes three times ...