The course introduces the basic concepts and strategies of psychological research. As research methods, course covers naturalistic observation, survey, test, inventories and self-report scales. Basic concepts and procedures in behavioral measurement, measurement and measurement scales, validity and reliability of measurement instruments are introduced. Types of variables, collection, organization, data summarization and illustration (e.g. graphical representation) are explained. Basic approaches and techniques of descriptive statistics such as frequency, frequency distribution, measures of central tendency (mean, median, mode) and dispersion (standard deviation, variance), probability distribution are explained.