Natural Sciences: Used to describe natural phenomena like material cycles and energy flows in ecosystems, such as the water cycle, carbon cycle, and cell cycle.
Engineering and Technology: Used to design and optimize production processes, improve resource utilization efficiency, such as lean production in manufacturing and intelligent scheduling in logistics.

Cycle diagrams can be classified into three types based on their function:
Process Cycle Diagrams: Show cyclical tasks or operations, such as project management cycles (PDCA cycle);
Cause and Effect Cycle Diagrams: Reveal positive and negative feedback relationships between variables, such as the inflation spiral;
System Cycle Diagrams: Describe the dynamic balance of complex systems, such as ecosystem cycles.

Define the purpose of the cycle diagram and list key variables;
The cycle diagram should have <=7 segments to avoid complex structures;
Unify arrow direction (clockwise/counterclockwise).

When interpreting cycle diagrams, grasp the structure and meaning of the chart as a whole, understand the relationships and cycle paths between nodes. Pay attention to analyzing the feedback mechanisms and key segments in the cycle diagram, and consider their impact and role on the system.