Creating Cirrus: The next generation Predix design language

Evolving our design system with a community-driven approach

Ken Skistimas
Dec 15, 2017 · 10 min read

During the history of GE Digital, there have been a few generations of design systems. The current incarnation of the Predix Design System, based on reusable web components, was launched about two years ago. At the time, our product suite was smaller and the design system was focused primarily on one product line and some very specific use cases. As GE acquired products, the number of teams building apps increased and so did the requirements and expectations of their customers.

Common feedback told us that the design system wasn’t flexible and lacked visual impact and appeal. The original design language was created with a very minimal style to suit our main objective at the time: speed of delivery. While it was appropriate at the time, expectations grew for a more refined and diverse design system for our products. The time was right to invest in an overall refresh of the design language for the entire system.

To measure our success, we outlined a set of goals for the effort:

  • Establish a more visually sophisticated design language
  • Increase the diversity of design patterns
  • Involve the design community to improve quality and adoption
  • Provide better guidance about how to use the design system.

Determining our viewpoint

Design with a purpose citing context and clear calls to action that allow for fast orientation.

Respect a user’s time and workflow.

Rely on familiar visual styles and similar interactions for common patterns across the suite of Predix apps.

Utilize modern visual and interaction conventions. Find opportunities to create and own innovative ideas.

These principles gave us a common language to speak about the work we were seeing and a framework to measure the success of existing applications and patterns for the refresh.

Design principles gave us a common language to speak about the work and framework to measure against with the immediate team and the product teams.

Connecting with the community

For the effort to be successful, we needed to invite teams into the process and give them a voice.

The previous version of the Predix Design System was built on the use cases and requirements of a single product. As other product teams appeared and applications evolved, a gap emerged. For the refresh to be successful, it was clear that we needed to invite teams into the process and give them a voice. We determined the best way to connect with the community and have them contribute was to conduct a series of workshops. Giving our stakeholders an opportunity to share their use cases, highlight challenges and brainstorm solutions would help us understand the needs of our users, build their investment in the System, and inspire design ideas for a System that would better address the everyone’s needs.

Auditing existing products gave us a baseline for where to focus the workshops.

Structuring and running the workshops

We scheduled six workshops, allowing sufficient time for remote teams to travel and attend. In the first session, designers shared their work and spoke about requirements and design decisions. This helped us validate our findings from the audit and update the remaining workshops, while participants could communicate their priorities and compare with design work across the company. The other five workshops were focused on foundational elements of our applications. This included focused sessions on navigation, page layout, color, and materiality as well as data input and data presentation.

Clearly outlining the goals for the workshops was critical for getting the most out of them.
Grouping people from different teams together during the workshops was a good catalyst for creativity.

We structured the design workshops in three-hour blocks to keep attendees focused and respect their time. An agenda was shared beforehand and we prepared a brief introduction and handouts for each session. We arranged the room with tables seating 5–6 people each, and asked people to sit with others than their usual co-workers.

We wanted to facilitate cross-talk between business units and inform participants of the broad range of requirements the design system needs to support. The time was divided between sharing work, enjoying an activity based on themes that emerged from the sharing session, and discussing output from the activity. Following each workshop, we provided detailed notes and pictures to the entire design community (those present and absent).

Defining the language

Our products are used in critical environments, where colors have distinct and important meanings, so we were very purposeful with our use of color. In addition, data visualizations are an important aspect of many Predix applications, where some of the most in-depth tasks are performed. It was logical to extend our data visualization color set for more meaningful and expressive charts and graphs; however, we also needed to consider how much color to lend to the foundational interface elements, such as menus, headers, and navigation. Ultimately, based on research from our Healthcare design team, we chose to add more colors to our neutral core palette and shift the tone from warm to cool. This gives a Predix application a personality that augments meaningful color usage within data visualizations and alerts.

The neutral core greys combined with the extended data vis palette allows for expressive charts that scale.

The next step was to interpret the objective of a visually sophisticated design language. Because readability of data on our product interfaces is so important, we wanted to keep our data input and presentation patterns clean. We saw the background materials as a good opportunity to add style to the design system. The existing system had a light theme and a dark theme, but we learned during the workshops that the choice didn’t allow much flexibility. For a richer sense of materials, we combined the themes while extending our foundational cool greys — now a signature element of the System. Unifying the themes doubled our core color palette and gave designers more ability to highlight important information and add visual interest. The palette also allows teams to define a unique style for their app within the Predix color family.

Combining our dark and light themes allows product teams a lot of flexibility in their layouts.

Animation and layering
Predix applications often relate to real-world devices and environments, and we wanted to bring some of that tactile approach to the design language. We created a system for layering user interface elements that adds physicality and reinforces visual hierarchy. Components sit at the bottom of a page, temporary elements, such as drop downs, sit in the middle, and modals and navigation sit atop all. The clear layering helps reinforce hierarchy and priorities during workflows.

Further building on our principle of elegance, we added motion to transitions. We choose places to add subtle transitions, where they would add to the experience and not hinder the efficiency. This resulted in lightweight animation treatments for navigation menus, panels, and loading spinners that augment the experience and make it more fluid.

Subtle layering of components and transitions bolster hierarchy and add to the overall elegance of the language.

The design system had relied on a practical, but not unique, open source icon font for its iconography. As we started applying the existing icons to our new, open, and modern language, we realized the bulky icons did little to help. Additionally, many teams didn’t have optimal metaphors because they were limited by the selection of the icon font. To fulfill the direction of our design language, we created a custom icon set that would let us address our industrial use cases and easily extend them when necessary.

A set of custom SVG icons was important to fulfill our design language. Design guidelines allow teams to extend the set as needed.


Before we committed to writing a line of code, it was important to stress-test our designs in real world applications.

We held monthly stakeholder readouts to recap the progress for designers, product managers, and engineers, to gather feedback on the design direction, and to field questions. In addition to demonstrating the core concepts and visual direction, we were able to show explorations by other teams to illustrate how the system would scale and apply to various applications. This proved a powerful way to visualize the community involvement and communicate the vision for our applications.

A Kanban board was the most productive way to manage progress within our team.

Once we were confident in our direction, the team went heads-down on implementation. We had to decide whether to release components in-progress or when all were ready. Typically, our team prefers continuous integration, but since this would be a breaking change, we chose to keep components in-progress behind a prerelease tag in GitHub. Having started the design process in January, we competed the huge effort and succeeded to ship the General Availability code in July.


  • 117 GitHub repos included in the release
  • 3,578 commits to those repos
  • 116 days of development time, for an average of 31 commits per day
  • 3484 automated unit tests for our Web Components, which we run against 6 browsers

Introducing Cirrus

Guidance and adoption

Published guidelines are helpful, but to be fully effective, our work needed to become part of a designer’s workflow. The previous iteration of our design stencil was built in Adobe Illustrator, and allowed some freedom, but didn’t provide much guidance on the functionality of components. The design stencil also allowed designers unfamiliar with the design system to easily veer away from available functionality in the components and inadvertently cause more development work for their teams. This created much friction for the product teams and confusion concerning what our components actually provided.

To avoid this, we built a completely new Sketch stencil relying on symbols to maintain parity with the functionality of the components. The symbols allow us to put rails on the customization and show designers how components work without entirely relying on the component catalog. The new stencil has been highly effective in boosting the productivity of designers as well as making their designs accurate.

Utilizing symbols in Sketch allows us to bring component functionality and guidance to the designer’s workspace.

Additionally, we doubled down on our on-boarding material on the site to clarify how to get started with the design system. As for the design guidelines, much of the material existed but was scattered. Sometimes showing is better than telling, so we created a sample app to illustrate how basic constructs like navigation, data visualization, and forms should work within an application.


GE Design

Stories from the designers empowering the world’s most complex industries.

Ken Skistimas

Written by

Product Design @ Facebook

GE Design

GE Design

Stories from the designers empowering the world’s most complex industries.

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch
Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore
Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade