# Agility Requires Safety: Engineering, Technical | Y Combinator

## Metadata
- Author: [[ycombinator.com]]
- Full Title: Agility Requires Safety: Engineering, Technical | Y Combinator
- Category: #articles
- URL: https://www.ycombinator.com/library/55-agility-requires-safety
## Highlights
- If you're building a prototype that you'll most likely throw away in a week, the cost of bugs is low, so it may not pay off to invest in tests. On the other hand, if you're building a payment processing system, the cost of bugs is very high: You don't want to charge a customer's credit card twice, or for the wrong amount ([View Highlight](https://instapaper.com/read/1513562021/19967673))