Understanding and Designing Structures without a Computer: Plane Structural Systems explains fundamental concepts of structural analysis and design, providing readers with a clear understanding of the behaviour of a wide range of structural systems based on their load-carrying mechanisms. The book employs a comprehensive qualitative and quantitative approach, supported by illustrative diagrams throughout. Clearly structured, the chapters guide readers from simple to complex concepts with new topics building on previous chapters. As a practical reference, the book equips readers with a solid understanding of universal structural principles, enabling safe conceptual and preliminary designs irrespective of the design code being used. It will also assist readers in interpreting and verifying computer-generated outputs. As the first volume in a two-book series, this title introduces fundamental concepts in structural engineering, including equilibrium and deformation analysis for both statically determinate and indeterminate structures. It explores the behaviour and design of beams, frames, arches and cables, including prestressing from an engineering perspective. Additionally, it examines cable structures such as suspension bridges, cable-stayed bridges, as well as stress-ribbons. The second volume progresses to more advanced topics of spatial structural systems, foundations and dynamics. Understanding and Designing Structures without a Computer: Plane Structural Systems is an accessible and authoritative resource for readers of all experience levels, fostering a clear understanding of structural behaviour without reliance on computer models.