A marketplace is 
      the place in which the demand and supply of buyers and vendors 
      participating in a business process may meet. Therefore, electronic 
      marketplaces are virtual communities in which buyers may meet proposals 
      of several suppliers and make the best choice. In the electronic 
      commerce world, the comparison between different products is blocked due 
      to the lack of standards (on the contrary, the proliferation of 
      standards) describing and classifying them. Therefore, the need for B2B 
      and B2C marketplaces is to reclassify products and goods according to 
      different standardization models. This paper aims to face this problem 
      by suggesting the use of a semi-automatic methodology, supported by a 
      tool (SI-Designer), to define the mapping among different e-commerce 
      product classification standards. This methodology was developed for the 
      MOMIS-system within the Intelligent Integration of Information research 
      area. We describe our extension to the methodology that makes it 
      applyable in general to product classification standard, by selecting a 
      fragment of ECCMA/UNSPSC and ecl@ss standard.