Textbook on the research methods (incl. Data collecting and data processing) used in dealing with demographic statistical data - outlines methodology used in determining population size, distribution and composition (incl. In respect of age group, sex, marital status, education, etc.), and describes measures used in calculating population growth and decrease, mortality, birth rate, fertility, marriage and divorce, migration, population projections, etc. Bibliographys at the end of chapters, graphs, references and statistical tables.