Often the word sustainability is used to designate that something is good, without any specification of good for what or good for whom.  Andreas Brekke has written the blog post "What is sustainability, really?" on  the blog pages of the Exilva project that sheds light on NORSUS' approach to sustainability.

It is a fast introduction to what sustainability is as well as explain our approach to the topic.

Consider it as a quick guide on how to carry out sustainability analysis and employing a life cycle approach to understand the impact of products.