The document discusses nursing theory, including its definition, purpose, and construction. It begins by asking what nursing theories are and why they are important. Nursing theories are then defined as conceptual frameworks that describe, explain, or predict phenomena in nursing. Theories are made up of concepts linked by propositions. Several influential nursing theorists such as Florence Nightingale and Hildegard Peplau developed theories by directly observing phenomena in clinical practice. The construction of theory involves identifying concepts and linking them with propositions to form a framework for understanding nursing phenomena.