The structure means that the SPST reports to both marketing and technology. This is known as a matrix structure.

What are the potential advantages and problems?

Home Depot is the world’s largest home-improvement retail, a global company that is expanding rapidly (about 200 new stores every year). With over 1,500 stores (mostly in the United States and Canada, and now expanding to other countries) and about 50,000 kinds of products in each store, the company is heavily dependent on IT, especially since it started to sell online.
To align its business and IT operations, Home Depot created a business and information service model, known as the Special Projects Support Team (SPST). This team collaborates both with the ISD and business colleagues on new projects, addressing a wide range of strategic and tactical needs. These projects typically occur at the intersection of business processes.