A watermelon seems green on the outside but it is red on the inside. As well as in reports, there are some indicators that are presented as if they were green due to flaws made in metrics calculation or wrong calculation function. As a result, Project Monitoring is damaged and Control is not activated to solve a problem, but, way more than a problem, a red light means a cry for help, it means a monitoring alert sent so a control action can be taken. Such a logic sequence in first of all monitoring and controlling items is not always followed and among other issues, traffic light indicators are commonly applied without the need of a precision measure. These are the atomic watermelons in projects and this book is an invitation for us to think about the way the current processing structuring organization is made in the PMBOK® Guide. We propose changes in it. You will learn about metrics and its meanings through a mix of equations and practical examples that may assist in enabling a reliable monitoring system besides a free projects´ control when atomic watermelons come up.