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A Stock and Flow Diagram Puts Amounts in Boxes and Rates on Valves

Notation node only, resting on stk-stock-vs-flow. It gives every later sub-domain a shared drawing surface; lop- draws its causal loops over it and lev- points at valves and boxes as levers. Deliberately stops at the line: what a cloud means for the boundary is bnd-'s system-boundary claim, and what an information arrow is worth is lev-'s information-flow lever.

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Building Stock-and-Flow Diagrams in Vensim for System Dynamics

Stock-and-flow diagrams represent dynamical systems using two core primitives: stocks (levels), which are quantities that accumulate over time via numerical integration, and flows (rates), which are …