The issue is of expectations and education. Many clients ask for the following without knowing better: - 100 pct uptime - Zero defects - Zero scope changes

The issue is of expectations and education. Many clients ask for the following without knowing better: - 100 pct uptime - Zero defects - Zero scope changes - Zero perceptible latency in all cases It is up to the professional specialist to educate the client in terms they understand. Only after explaining in terms they understand can you call them unreasonable. If the client understands and is still unreasonable, the true professional has the obligation to walk away.