Scientific explanation · BEGINNER LESSON
Read
A mechanism is a system of entities or parts whose activities and interactions are organized to produce, underlie, or explain a phenomenon. It is always a mechanism of some specific phenomenon, not a standalone object.
What it is
In science, a mechanism is the organized set of parts and activities that explains a phenomenon such as a behavior, capacity, or end state. The sources describe it as a complex system whose parts interact by causal relations, and they stress that a mechanism is always tied to some phenomenon it explains. A plain object by itself is not a mechanism unless it is doing something in that explanation. [0,1,2]
[1] Mechanisms in Science - Stanford Encyclopedia of Philosophy [2] Mechanisms in Science - Stanford Encyclopedia of Philosophy [3] Mechanisms in Science - Stanford Encyclopedia of Philosophy
How mechanisms work
A mechanism has several needed pieces: the phenomenon, the parts, what the parts do, and how the parts are organized; some accounts also note different levels of organization. Mechanisms can be the result of direct causal laws, but they are not limited to simple push-and-pull motion. They may include other kinds of causation, feedback loops, cycles, and active regulation that keeps a system near equilibrium. [0,1,2]
[1] Mechanisms in Science - Stanford Encyclopedia of Philosophy [2] Mechanisms in Science - Stanford Encyclopedia of Philosophy [3] Mechanisms in Science - Stanford Encyclopedia of Philosophy
What scientists look for
Scientists look for relevant factors only: enough detail to explain the phenomenon, but not every detail about the object. The boundary of a mechanism is set by what matters for the explanation. Because of this, the same object can be part of one mechanism and irrelevant to another. [0,1,2]
[1] Mechanisms in Science - Stanford Encyclopedia of Philosophy [2] Mechanisms in Science - Stanford Encyclopedia of Philosophy [3] Mechanisms in Science - Stanford Encyclopedia of Philosophy
Limits and common misunderstandings
Mechanisms are not always deterministic; some are stochastic, meaning they involve chance or instability in how parts interact. They are not necessarily localized in one place, and they are not the same as machine design. Correlation alone is also not a mechanism: a matching pattern between variables does not by itself explain how a phenomenon is produced. [0,1,2]
[1] Mechanisms in Science - Stanford Encyclopedia of Philosophy [2] Mechanisms in Science - Stanford Encyclopedia of Philosophy [3] Mechanisms in Science - Stanford Encyclopedia of Philosophy
SEE THE IDEA
How a scientific mechanism is identified
The behavior or end state that needs explanation.
The entities and what they are doing.
How the parts are arranged and interact.
Only factors relevant to the phenomenon are included.
Phenomenon is explained by parts doing activities in an organized way; relevance decides what belongs in the mechanism.
A mechanism is not just a thing, but an organized explanation of how a specific phenomenon happens. [0,1,2]
TRY IT YOURSELF
Test your understanding
Choose an answer, then check the explanation.
PUT IT TOGETHER
Match each concept to its meaning
Drag a label onto its description, or select a label and then select a description. This also works with a keyboard.
4 pairs to match
Sources and further reading
This general lesson was generated from public source material. It explains a concept; it does not interpret a private paper or provide medical advice.