ISO 14045:2012 describes the principles, requirements and guidelines for eco-efficiency assessment for product systems including:

the goal and scope definition of the eco-efficiency assessment
the environmental assessment
the product-system-value assessment
the quantification of eco-efficiency
interpretation (including quality assurance)
reporting
critical review of the eco-efficiency assessment.

Requirements, recommendations and guidelines for specific choices of categories of environmental impact and values are not included. The intended application of the eco-efficiency assessment is considered during the goal and scope definition phase, but the actual use of the results is outside the scope of ISO 14045:2012.