"Software Engineering- Fundamental Approach" is a comprehensive and well-structured textbook that serves as a foundational guide for students, educators, and professionals in the field of Computer Science and Engineering. This book presents a balanced blend of theoretical concepts and practical applications essential for understanding the complete software development lifecycle. Beginning with the basics of software engineering, the book covers essential topics such as software development processes, life cycle models, requirements engineering, system design (both function-oriented and object-oriented), project planning, testing strategies, quality assurance frameworks, and software metrics. Special emphasis is given to standard models like Waterfall, Spiral, Prototype, and Iterative Enhancement, as well as modern practices aligned with IEEE standards and SEI-CMM models. Richly illustrated with real-world examples, diagrams, and step-by-step case studies, the book also explores critical aspects like software project feasibility, SRS documentation, verification and validation, and metrics like Halstead's Software Science and Function Point Analysis. Its simplified language and structured content make it highly suitable for undergraduate and postgraduate learners, as well as aspirants of competitive exams like GATE, NPTEL, and UGC-NET.