We live in a complex and connected world. Every day we interface with many people face-to-face and via email and social networks. Every day we try to solve many simple and complex problems. Everyday we make many decisions. Sometimes we do a good job; more often we could do better. But suppose we have a better understanding of our own individual environment - of our own personal world - and suppose that we have good tools to help us, and suppose that we have step-by-step procedures to follow, and suppose that we have the desire to enrich our environment, and suppose that we have the strategies to do all these things, then could we do better in the many things that we do? This book presents ideas and concepts to help you plan, make decisions, and identify appropriate actions you could take to get what you want The reader is introduced to the concept of Systems Worlds, to a critical thinking approach called Systems Thinking, and to the scientific concepts of systems analysis, systems engineering and decision theory. These disciplines are combined in an easy to understand approach that uses examples, diagrams, tables, and checklists. These ideas and techniques apply to individuals and organizations and can be used in personal, family, business, government, and educational environments. The book is divided into three parts. Part I describes the concept of Systems Worlds. My Systems World helps the reader focus on the parts of his individual connected world which affects his current and future environments. Part I also describes Systems Thinking as a way of thinking about the environment in My Systems World. Part II describes decision making approaches and tools. Essentially everything one does in life involves making decisions. Some decisions have major impacts both on us and on others. Part III integrates systems thinking with decision making approaches. It contains a 5-step approach which can be used to solve many problems that arise in My Systems World.