Items to consider for a product feasibility decision:

• Determine which 'available' technologies are viable candidates for product implementation; which fit the performance-price boundary.
• Determine of any technology or science needs to be further developed or validated in order to build the product.
• Determine what software, supporting services or auxiliary components required also required.
• Describe physical attributes such as size, weight, handling issues. Can the physical embodiment meet the envisioned product?
• Detail the standards, legal, environmental and regulatory requirements and determine if selected technologies can even meet the standards.
• Are unique power situations required?
• Can costs be reasonably met?
• Will specialized production facilities or techniques be required?
• Will the concept be robust in the expected environments?

Items to consider for the PRS:

• Preliminary theory of Operations
• Define basic product architecture
• Describe functionality algorithms with flow charts, state charts, etc. (PRS)
• Develop block diagrams and other descriptions of the subsystems and components (PRS)
• Review COTS / MOTS components and subassemblies for potential 'Buy vs. Build' (EXR)
• Product performance goals (PRS)
• Define detailed testing strategy (EVT (alpha), DVT (Beta), PVT (validation)
• Preliminary BOM and COM (PRS)
• Techniques and standards for design, development and special equipment (SOP)
• ID requirements and concepts (PRS)
• User and other equipment Interfaces (PRS)
• Mechanical requirements (PRS)
• Electrical requirements (PRS)
• Software/firmware requirements and flow / state charts (PRS)
• Appropriate design tools may be procured in this stage (EXR))
• Testability requirements (measurable results) (DTR²)
• Regulatory (e.g., EMC, safety) and environmental (e.g., RoHS, WEEE) requirements
• Perform an objective Design review and fault analysis (DDOC)