Your organization must make provisions for all environmental aspects during the whole lifecycle, including end of life. Identify all relevant steps after the product leave the plant or the service is provided, and for each step determine possible aspects and impacts. I always give the example of manufacturing AA batteries, imagine what a consumer can do after the battery becomes dead. That is why packaging tries to influence consumers to give a proper final disposition. A normal procedure for aspects and impacts determination can be used as long as the methodology applies to those steps after selling.
The following material will provide you information about implementing the life cycle perspective: