This document discusses research problems and types of variables. It begins by outlining the stages of the scientific method and then describes three types of research questions: descriptive, relationship, and difference questions. Next, it covers criteria for selecting a research problem, such as interest, significance, and manageability. The document defines key terms like research problem, variables, and types of variables. It also discusses formulating a well-defined research problem and outlines components of a research problem statement, including delimitations, limitations, and assumptions.