Factor X is an index that quantifies the idea of maximizing product value while minimizing impact on the environment. "X" is a value that compares a new product to a baseline product. The larger the X value, the greater the improvement in product performance and the lower the environmental impact. For example, a factor of "4" indicates a fourfold improvement in environmental consideration.
Our calculation of Factor X was originally based on three elements: the reduction of input resources, the reduction of energy used in production, and the avoidance of emission of substances with potential environmental risks. We have since added to these the level of product performance improvement. After we reviewed this formula, we changed the base year from 1990 to 2000, as well as using lifecycle CO2 emissions in place of energy consumed. Mitsubishi Electric now bases the index on these new rules.