Introduction -- Fuzzy Set Theory -- Relational Databases and Fuzzy Classification -- Customer Relationship Management -- Fuzzy Customer Classes -- Fuzzy Classification Applied to Online Shops -- fCQL Toolkit -- Conclusion.

Small- and Medium-sized Enterprises (SMES) can benefit significantly from investments in e-commerce and e-business. However, the adoption of e-commerce has been quite slow and limited among SMES, especially in transition economies. Interviews were conducted with senior managers from 30...