Compatibility {#14} determines where and with what a product is used; it influences:

• General product risks, market selection and user type
• Product performance and validation
• Documentation, training, service and support
• Production processes, tests, tools and equipment
• Technology selection and product validation
• Selection of suppliers and production facilities
• Selection of ancillary products and components
• User demands
• Environmental and regulatory standards compliance
• End-of-Life requirements and procedures

For example, If the market expects a product to perform well in a certain environment, say below freezing temperatures, then it must be designed and validated to operate there even if the product developer did not intend such operation.  Also, if a product is claimed to be portable, then a customer will attempt to operate the product wherever the customer chooses to go.