Poor Workmanship
Projects can get done on time and the design might be great as well, but if the workmanship and/or quality are poor, both of the first two items are cancelled immediately. Truth is, we all intuitively know this but often make poor decisions because we are compelled by urgency and budgets. Poor quality, however, is a mistake that companies have to live with for a lifetime. Even worse, poor quality will often result in rework—now the project has been paid for twice!