Structural engineers are focused on designing a safe structure by following the parameters and factors in the codes and standards that are requested in the project specifications. After finishing the design stage, the structural engineers who work onsite receive the drawings and specifications from the designer and begin their job by performing the project construction. Then their colleagues, who work on the operations and maintenance phase, will start monitoring and maintaining the structural performance during the lifetime of the structure. So, around this project life cycle, all of the structural engineers are focusing on the same target, which is that the structure will maintain the safety throughout its service life according to the design code. The main objective of this Paper is to cover the methods that enable us to have a reliable structure during all the project phases, and also examine that how much the Reliability based design is different from that of the Indian Limit State Design from a practical point of view, the up-to-date methods that predict what the lifetime of the structure will be. Many researchers have been discussing the reliability analysis, which means the same as calculation of probability of structure failure, and this calculation depends mainly on the statistics and theory of probability. Therefore, there is an entire chapter devoted to discussing all of the statistics methods, tools, and probability theory that are used in structural and civil engineering fields from a practical point of view and away from the complicated approach that does not benefit one in a real practical way. It is worth mentioning that there is an increase in research concerning structure reliability as we have innumerable data worldwide from which we can calculate the concrete structure reliability.
