What's "mine" ? and how much?

Recently, I was asked to showcase my portfolio of work to someone.
As long as I was full-time 'graphic designer', this was an easy task to do.
It was doable once I became a 'web designer' too - my work was still largely related to visual design.

As an interaction designer, I could still do this. Fortunately most of my early interaction design projects were with real products and I had a 'before and after' that I could showcase. Also, I was solely responsible for all the interaction design aspects of these products.

The last 5 years of my career has been rather different. I am a designer - part of a very large globally distributed user experience team. While I am officially designated as a designer, my tasks are not restricted to this. I've accomplished many things, however, I face a challenge to create a 'physical portfolio' that showcases these things.

In all my projects, I have strived to and have driven the attempt to get a 'holistic' understanding of the topic on hand. To do so, I have often engaged with with a huge number to stakeholders - developers; solution managers; field services; marketing and sales consultants; other designers to finally arrive at a democratic decision on things. Sometimes, we are lucky if this decision and its execution reaches the 'end-users' as intended.

However, often, the decisions get re-visited due to limitations that get discovered later on during execution. The final solution that reaches the hands of the end-users often only faintly resembles what we had all agreed on.
So, is my 'contribution' still valid?
(I believe, only that which an end user can touch and feel and use matters. The design of the solution will be judged by it's users on what they can see, touch and feel. They are not aware of all the wonderful designs I have in my drawer. Unfortunately, what they judge may have nothing to do with what I had designed.)
It is not at all gratifying to put some such work in my portfolio, when my work actually never reached the hands of an end user.
Besides, given this mode of working - what is it that I can call "mine?" (MY contribution)? Ideas came from every contributor and it was a joint /team effort. So how do I filter out 'my' contribution out of it?

A lot of sub-conscious things happen while we are working on such projects:

• key personal relationships are built (to be tapped on later)
• learn about competencies of one another (to be leveraged appropriately later)
• mindsets have been changed
• newer communication channels have been established
• market/ customer insights have been gained
• new geographic locations visited/ worked with colleagues from a different culture
• impressions made about individuals

All of these I believe are 'significant' aspects of working in a project and could be 'contributions' of an individual. My approach of 'holistic' thinking is extrement 'multi-directional' and creating a 'portfolio' that showcases just 'my' contributions is too 'uni-directional'.

Aren't tasks and words like 'breaking organizational silos;' 'holistic approach' self-explanatory enough of their inherent challenges and the resulting accomplishments?

How does one 'showcase' such things in a portfolio (other than 'words') when I rarely restrict my work to sketching a piece of UI?