Cost is not a key element of DfR&M. The primary focus of DfR&M is to ensure that a product meets its reliability and maintainability requirements, while cost is a secondary consideration.

The primary goal of DfR is to minimize the probability of failure by designing products that are robust and resistant to failure.

The primary goal of DfM is to minimize the time required to repair or replace a failed component by designing products that are easy to access and repair.

Design of Experiments (DOE) is not a common DfR&M technique. DOE is a statistical method used to optimize the design of a product or process.

The purpose of a FMEA is to identify potential failure modes and their causes and effects, assess the risk of failure, and develop strategies to mitigate the risk of failure.

The purpose of a FTA is to identify the root causes of a failure, develop strategies to prevent the failure from occurring, and assess the risk of failure.

The purpose of a RBD is to model the reliability of a system by representing the system as a network of components and their interconnections.

Return on Investment (ROI) is not a common DfR&M metric. ROI is a financial metric used to assess the profitability of an investment.

The relationship between reliability and maintainability depends on the specific product or system. In some cases, reliability and maintainability may be directly proportional, while in other cases they may be inversely proportional.

Make it easy to access and repair failed components is not a common DfR&M best practice. DfR&M best practices focus on preventing failures from occurring in the first place.

The primary goal of a DfR&M program is to ensure that the product meets its reliability and maintainability requirements.

Statistical Process Control (SPC) is not a common DfR&M tool. SPC is a statistical method used to monitor and control the quality of a manufacturing process.

The primary benefit of DfR&M is all of the above. DfR&M can help to reduce the cost of maintenance, increase the product lifespan, and improve the product performance.

Cost is not a common DfR&M challenge. DfR&M is often seen as a cost-effective way to improve the reliability and maintainability of a product.

DfR&M will become more important as products become more complex. As products become more complex, they are more likely to fail. DfR&M can help to prevent these failures from occurring and make it easier to repair them if they do occur.