Marks & Spencer will start implementing SAP software in its core systems next year following successful implementation in other parts of the company.
The project, which will commence early next year, will take a couple of years to complete.
"Following its successful implementation in finance, non-merchandise procurement and within international, we will begin implementation of SAP within our core commercial systems in the UK in early 2010, with a phased roll-out through to 2012," said a company statement.
The implementation is part of the retailer's "2020 Doing the Right Thing" programme, which will focus on changes in operations, new avenues to market, international developments and brand communication.
M&S is increasing investment in IT despite reducing its overall spending. To do this it will reduce spending on property.