ERP philosophy has been designed in an attempt to satisfy all kinds of companies in almost all sectors, using parameters to fit each one. This aspect requires implementtation teams to have a profound knowledge of the sector in order to fit the ERP to the profile of each company. At the European level, the e-Business Watch survey, financed by the European Commission [21], compared the IT situation of the metal transformation sector with all sectors. Figure 1 shows the average diffusion of online technologies for the different types of applications. In two applications, the metal transformation sector outperforms the average: the usage of ERP systems (25% in metal producís and 20% on the average) and in Internetbased knowledge management solutions (12% in metal products and 10% on the average). In order to discuss the ERP implementation state of the sector, we have found data which shows the percentage of ERP implementation in firms segmented by size. Figure 2 illustrates the differences in each size.