When I started at Anadarko - Advanced Analytics and Emerging Technologies (AET) team, there wasnt any design system in place. However my previous team had talks to have one. After I joined, me and my collegue another UX designer we formed team to bring in design system in place. We laid out a plan.

 

 

Do a UI Inventory

Create a dedicated place for designs system

Prioritize components

Bring in UI Team to implement components

Document components

User testing of finalised components

Maintain & update components

 

 

So before we started with the design system work, we had a challenge to find out where we are in the Org structure, such that we get a buy in and support from other teams. As part of the development team, there was talk about design system structure. Here is th example of the structure when I joined, which later changed into many other structure because of the over all Org level change.

 

 

UI Inventory

As part of the I inventory exercise, we looked at :

We looked at the style guide document from the previous team, which existed in "Onenote".
We continued to enhance the Design Process and the Design System Structure. 
We listed down all the components from the projects.
Created a UI inventory of the components

Style guide document from the previous team, which existed in "Onenote".

onenote

Style guide in XD- This is Version 0.5 of the source file. So for us to start with I made this Version as Version 0.

xd

We continued to enhance the Design Process and the Design System Structure. We met with other team to form a Design System team, and enhance the structure

design system structure

Org structure was changing in Anadarko, however we tried to keep up with the teams so that we have a unified design system. While we were working on the design system, below image shows how our team was structured and we belonged to the COre development Services.

Core development team

Prioritize Components

Collect all common components from all products. Review UX of the component usage. Create new component. Verify with UI Inventory, with the product, with the teams, Do a user testing Document Share for implementation with the UI team