Complex projects often face challenges such as delays, budget overruns, and unexpected disruptions.Reference-class forecasting can help in estimating project outcomes by looking at similar past projects.Event Storming technique can be used to map out users' success moments and identify risks and bottlenecks.Black Swan events, low-probability high-consequence occurrences, can impact project timelines and outcomes.To increase project success, minimize mistakes by repeating smaller work modules and using reliable tools and teams.Good planning, testing, and risk management are crucial for successful project delivery.Design and research should be viewed as essential risk management tools to mitigate project challenges.The book 'How Big Things Get Done' provides insights into project success and failure.Dedicating time to planning, managing risks, and continuous testing are key factors for project success.Success in complex projects lies in working around unknowns and continuously testing and refining.