A behaviour-over-time graph puts time on the horizontal axis and a named quantity on the vertical axis. Plot dated observations when you have them. Label a remembered or hypothetical sketch as such, and include the units and interval.

A graph can reveal a rising stock, a plateau or repeated swings that one snapshot misses. It does not tell you which mechanism caused the pattern. Several combinations of flows, decisions and outside changes can produce similar shapes.

Use your map to propose explanations and your observations to question them. Predicting a detailed path also requires quantities, response rules, timing and starting conditions; a CLD alone does not supply those.