Walmart U.S. CEO Greg Foran gave Wall Street an update on how his re-invention of the retailer’s stores is going, but acknowledged there is a lot more work to do.

Wal-Mart Stores WMT 0.55% acknowledged last year that it had big problems to solve in its U.S. grocery business. Customers thought its fresh food was unappealing and often found empty shelves because of problems in the supply chain. Furthermore, rivals had started to undercut the retail giant on prices.

In the fall, Wal-Mart issued an “urgent agenda” memo to its U.S. store managers, setting guidelines aimed at boosting sales of “chilled and fresh” food. But that was just one part of Walmart U.S. CEO Greg Foran‘s big push to improve the in-store experience for shoppers at a time of tough comparable store sales for a division that brought in $288 billion in revenue last year, or 60% of the company’s overall.

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