Dichotomous Key Maker

What is a dichotomous key?

A dichotomous key identifies an item by a sequence of paired alternatives. Each choice narrows a defined candidate set until the reader reaches a named endpoint.

Use it when observable traits separate a known set

A key is useful in identification exercises and collection guides. It works within its stated scope: an item outside the candidate list may not have a valid route.

Make each choice testable

1. Define the candidate set. Say exactly which organisms or objects the key covers.
2. Offer two alternatives. Each decision should divide the remaining candidates into distinct groups.
3. Use observable traits. Prefer features the reader can actually inspect with the stated equipment.
4. Avoid vague comparisons. Replace terms such as big with a measurement or a clearly defined contrast.
5. Trace every endpoint. Each candidate needs an unambiguous path that uses accurate traits.

A key to test against specimens

MyMap arranges your trait information into paired branches and revises the choices when you identify a problem. The fixed animal example is a simplified classroom sketch; its broad backbone, temperature, and leg-based splits are not a comprehensive animal identification key.