the clubcard data has also helped tesco to identify areas where customers are positively inclined towards online shopping and launched tesco.com in 1997. today, it is the world's leading grocery internet retailer with an average of 150,000 orders per week and a leap in profit of more than 50% from 2004 to 2005 (tesco 2006,p.28). since 2006, clubcard vouchers can also be used for online shopping at tesco.com.