First, remember that ISO 14001 uses the word “considering”. That means that you should evaluate if in your organization’s case it is relevant to try to control or influence environmental aspects beyond the organization’s borders.
So, when determining environmental aspects think about are there relevant environmental aspects related with:
Suppliers or transport to your facilities?
Development and tests of new products and/or services?
Manufacturing or provision?
Storing and transport to customers?
Installation and or servicing?
Use by users?
Final disposal by owners?
The following material will provide you more information about aspects and impacts and life-cycle: