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Working Relations Index® Study

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.

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


North American OEM-Supplier Working Relations Index®
20th annual study results

Automotive supply line
2 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.
Dave Andrea
Article January 28, 2020 2 min read
Engine components
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.
Daron Gifford
Article January 28, 2020 2 min read

After meeting with a variety of consulting companies in North America and Europe, I concluded that Plante Moran was the only company suited to continue PPI’s work of helping companies develop and maintain collaborative supplier relations. Their philosophy of working for the good of their staff and clients, which has ranked them among FORTUNE magazine’s “100 Best Companies to Work For” for more than 22 years, is an essential element of collaborative relations, and will help PPI’s clients promote even stronger collaborative relations with their suppliers.

John W. Henke Jr. PH.D

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Automotive Leadership