Skip to Content
Automotive workers working on an assembly line.

Working Relations Index® Study

Plante Moran Logo

Measuring and improving company-supplier working relations

The North American Automotive OEM-Supplier Working Relations Index® (WRI®) Study is a comprehensive annual survey that examines the working relations between Tier 1 suppliers and their North American-based OEM customers from the suppliers’ perspective. Using our proprietary WRI® methodology, the qualitative working relations of each OEM are quantitatively determined and ranked on a 500-point scale.

The WRI® Study is valued by OEM leadership and the automotive industry overall. We invite suppliers to share their firm’s day-to-day working experiences with the OEMs for whom they have commercial responsibility through this confidential study. This honest supplier feedback provides actionable information and can help improve timeliness, cost, and quality of every interaction between OEMs and their supply bases.

Auto supplier working relations study shows uphill road for OEMs
The results of the 19th annual North American Automotive OEM - Supplier Working Relations Index® (WRI®) Study indicate auto OEMs’ slight improvements in supplier relations pale to significantly greater industry trends.
Press Release June 17, 2019 6 min read
OEMs: Why benchmark supplier relations with our Working Relations Index® study?
Supplier relations are complex and dynamic, influencing product development, cost competitiveness, quality, and more. Here’s how our North American OEM-Supplier Working Relations Index® study can help you hear the voice of your suppliers.
Article January 28, 2020 2 min read
Auto suppliers: Why take our Working Relations Index® survey?
Your OEM relationships have a direct influence on orders, top-line revenue growth, costs of doing business, and your ultimate return on investment. Ever wish you could share candid feedback with your customers? You can. Here’s how.
Article January 28, 2020 2 min read

History of the North American Automotive OEM-Supplier Working Relations Index® Study

The WRI® Study is rooted in academia and continues to follow the same quality standards today. The study began in the early 2000s when Professor John Henke sought to independently survey suppliers and discover their perceptions of working with their North American OEM customers and what was driving these perceptions. The Henke survey continued on with Planning Perspectives, Inc. (PPI), which joined Plante Moran in January 2019. Our manufacturing and automotive teams have experience working with both suppliers and OEMs for over 90 years and provide comprehensive audit, tax, and consulting services to help companies succeed.

Supplier working relations 


Taking the WRI® Study forward

Testimonial quote by John W. Henke on Plante Moran moving forward with the WRI study.

Our proprietary insights:

Stay up to date on data-driven insights to propel your business forward.

Subscribe Now