Rebecca Liggero talks to Dunnhumby Clive Humby  as he talks about Tesco ClubCard  and Customer Loyalty Program.

Tesco Clubcard is the loyalty card of leading British supermarket chain Tesco and operates in the United Kingdom, Ireland, Czech Republic, Hungary, Poland and several other countries, and in the UK market in particular has been highly successful, with over 15 million members as of 2010.

Why do you have loyalty cards in your retailer?

“Because you don’t know who your customers are. This way you can join their shopping basket together and see: what they like buying, when they like buying it and what they’re doing. And it’s very powerful for the retailer and powerful for their suppliers,” Humby said.