Final answer:
Criteria are standards used to evaluate and compare designs, such as when assessing flameless heaters for safety, efficiency, and durability. These standards are essential for determining the success of a product, and can vary based on the prioritized aspects of the design.
Step-by-step explanation:
Criteria are defined as standards or measurable attributes that are used to compare and evaluate different designs or options. For flameless heaters, criteria might include safety, energy efficiency, cost, ease of use, and durability. These criteria help ensure that the final product meets certain predetermined standards which are necessary for the design to be considered successful.
As an example, in the case of flameless heaters, safety might be a top criterion to measure how well a heater operates without posing a risk of fire. Energy efficiency could be a criterion that measures how much energy is consumed while maintaining a comfortable temperature. Durability would be a standard to gauge how long the heater will last under normal usage conditions.
Criteria can indeed vary, depending on what aspects of the design are prioritized, and personal preferences might influence how an individual evaluates a product, although they are different from objective evaluations which are based on predetermined criteria.