📈Reference Mode

NEW

Also known as: Reference Behavior

A graphical description of a problem variable’s historical behavior over time used to define and bound a system dynamics problem.

DESCRIPTION

In system dynamics, a reference mode depicts the behavior of key variables over time to frame the problem being studied. It communicates patterns such as growth, oscillation, or decay, serving as a target for model replication and explanation. Reference modes help align stakeholders on the nature and scope of the issue. They guide model boundary selection and hypothesis generation about feedback structures. Constructed from data or expert judgment, they can be qualitative sketches or quantitative time series. They are often accompanied by narratives that describe key events and regimes. Reference modes underpin scenario design and model validation.

ALTERNATIVE DEFINITIONS

isee systems

A reference mode is a graph that shows how a key variable has behaved over time and is used to define the problem a model will address.

Emphasizes graphical depiction and its role in problem definition.

Source

MIT OpenCourseWare

Reference modes depict the historical behavior of variables of interest over time, providing a baseline pattern that a model should reproduce and explain.

Links reference modes directly to model reproduction and explanation.

Source

RELATED TERMS

System Dynamics Behavior Over Time Graph Stock and Flow Diagram Model Boundary Problem Articulation Scenario Planning Temporal Data Baseline Trend Target Condition

COMPETING TERMS

Causal Loop Diagram

RELATIONS

• Broader: Mode

KNOWLEDGE AREAS

Domain & Business Context Data Visualization Transformation Process Data Science

TARGET AUDIENCE

Data Strategy Consultant Digital Transformation Manager Enterprise Architect Data Scientist Information Analyst

EXTERNAL SOURCES

• Wikipedia - System dynamics
• MIT OpenCourseWare - Course materials introducing reference modes
• isee systems - Tool help page on reference modes
• System Dynamics Society - Overview of system dynamics practice

TOP QUESTIONS

What is a Reference Mode in system dynamics?

A reference mode is a behavior-over-time depiction of key variables that frames the problem a model should explain and reproduce.

Category: Definition

Why is a Reference Mode important?

It aligns stakeholders on the problem pattern, guides model boundary and hypotheses, and provides a baseline for validation.

Category: Relevancy

How do you create a Reference Mode?

Use historical data when available; otherwise, elicit expert sketches. Annotate with events and regimes to capture structural changes.

Category: Requirements

What patterns do Reference Modes capture?

They capture archetypal behaviors like exponential growth, goal seeking, oscillation, S-curves, and overshoot and collapse.

Category: Example

How does a Reference Mode relate to Causal Loop Diagrams?

Reference modes show behavior; causal loop diagrams propose feedback structures explaining that behavior. Both complement early modeling.

Category: Comparison

What mistakes occur when defining Reference Modes?

Using too-short windows, mixing variables, or ignoring structural breaks can mislead modeling efforts.

Category: Mistakes

Can Reference Modes be qualitative?

Yes. Sketches are common when data are scarce, but should be validated and refined as evidence accumulates.

Category: Opinion

How many variables belong in a Reference Mode?

Start with one to three that characterize the problem. Add others only if they clarify key dynamics.

Category: Guidance

How is a Reference Mode used in validation?

Models should reproduce reference-mode patterns under historical conditions, supporting structural validity before policy analysis.

Category: Testing