Think about your past projects. Did they finish on time and on budget? Did they end up getting delivered without cutting corners? Did they get disrupted along the way with a changed scope, conflicted interests, unexpected delays, and surprising blockers?
Chances are high that your recent project was over schedule and over budget — just like a vast majority of other complex UX projects. Especially if it entailed at least some sort of complexity, be it a large group of stakeholders, a specia