This book deals with the design and building a stemming algorithm for the Albanian language and than using it to classify a corpus of documents. The work is based on research on stemming algorithms of other languages and the morphology of Albanian. Text Mining is a knowledge-intensive technique that is used to interact with a collection of documents by employing a set of analysis tools. Data/Text Mining (data can be text) is becoming a very useful process today for gathering information based on stored data. The most useful fields where data mining helps most are medicine, banking, finance,...