The art of sample manipulation considers adequate sample collection, preservation and storage, as well as its safe preparation. Analytical chemists often find themselves in a position to spend considerable more time and effort in preparing samples rather than analysing them. In many cases the reliability of analysis is limited by the correctness of sample manipulation. The skills of sample manipulation are based on abundant knowledge, competence and rich experience. Being indispensable in every laboratory, educational or scientific institution, this book encompasses all relevant issues related to collecting samples of any kind, as well as methods of sample preparation for specific analytical goal. The presented material provides an overview of sampling principles and strategies supporting them with inevitable statistical background.