Integrating operational safety into the design process

The designer must integrate all phases of the life cycle of the system and its components into his process. He must opt for solutions that are simple to produce, inexpensive, highly reliable, safe, easy to maintain and have an overall life-cycle cost that is attractive to the consumer. Our contribution in this work is to develop models and tools to answer the following questions:  How can reliability be taken into account in design? How can we integrate the notion of safety (machine, user) into the product design phase? How can maintainability and availability be measured at the design stage