Final answer:
The approach that emphasizes identifying key variables in each management situation, understanding the relationships among these variables, and recognizing the complex system of cause and effect is known as systems thinking.
Step-by-step explanation:
The approach that emphasizes identifying key variables in each management situation, understanding the relationships among these variables, and recognizing the complex system of cause and effect is known as systems thinking. This approach recognizes that every management situation is unique and involves interconnected variables that affect each other. By understanding these relationships, managers can make more informed decisions and solve problems more effectively.