Although implementing ISO 14000 standards is entirely voluntary, more organizations have noticed how participation brings business practices into alignment with international standards. These standards may be used for any business, organization, or entity to monitor and minimize environmental impact. Any entity may apply for ISO 14000 certification. However, the International Organization for Standardization sets strict criteria for eligibility and approval. In most cases, ISO 14000 certification is reserved for use by organizations outside of contractual processes. For example, construction crews would not likely seek ISO 14000 certification. A manufacturer would want to implement ISO 14000 practices.