Undecidability

Context

• Humans aren't nearly so smart or inventive as they think they are. They typically over-estimate that change that can be effected in the short term, and underestimate the change that can be effected for the long term.
• It is now well known that no system of logic as complex as arithmetic can be complete. There are things that are true that cannot be determined in advance.
• Project managers often require a detailed design before they will start the project. This is understandable, and a good strategy, but the tactics of implementing the strategy cannot be so rigid or the result will be unsatisfactory, even to the designer.