It’s often hard for teams to get sufficient time and resources for the amount and quality of tests they think are needed. It’s like management wants testing done but at the same time doesn’t want to commit what’s needed to do it. If that's your case, look at the business side, rank priorities, and negotiate resources.

Technology allows amazing innovations to optimize business and deliver new and better services, but if you don’t carefully consider your entire user community, innovations may cost you business. When designing for stakeholders, don't stop at the obvious cases—or else you may find that you forgot an important customer.

Research suggests that humans are biased, not-very-rational decision-makers. We believe we see things clearly when the evidence shows otherwise. Throw in a big dose of optimism, and it's easy to see how estimating software projects can be problematic. Our best hope is to construct diverse groups with varied viewpoints.