INDUCTIVE VS DEDUCTIVE
Main Difference
Inductive reasoning:
Develops a theory from observations.
Moves from specific observations to broad generalizations.
Deductive reasoning:
Tests an existing theory.
Moves from broad generalizations (theory) to specific conclusions.
/Inductive = observations → theory
/Deductive = theory → test with observations
Inductive Research Approach
When to use:
Little or no existing literature or theory on a topic.
Stages:
Observation
Example: A low-cost airline flight is delayed.
Observe a Pattern
Example: Another 20 flights from low-cost airlines are delayed.
Develop a Theory
Example: Low-cost airlines always have delays.
Limitations:
Conclusions can never be proven—only invalidated.
Example: Observing 1000 delayed flights supports the theory but doesn’t guarantee flight 1001 will be delayed. Larger datasets increase reliability.
/Inductive research builds general theories from specific observations, but its conclusions are always open to being challenged
Deductive Research Approach
When to use:
When there is an existing theory to test.
Stages:
Start with an Existing Theory
Example: Low-cost airlines always have delays.
Formulate a Falsifiable Hypothesis
Example: If passengers fly low-cost airlines, they will always experience delays.
Collect Data to Test Hypothesis
Example: Collect flight data on low-cost airlines.
Analyze and Test the Data
Example: 5 out of 100 flights were not delayed.
Decide Whether to Reject the Null Hypothesis
Example: Since some flights were not delayed, reject hypothesis.
Limitations:
Conclusions depend on the truth and clarity of premises.
Example:
Premises: All dogs have fleas; Benno is a dog.
Conclusion: Benno has fleas.
If first premise is false, conclusion is unreliable.
/Deductive research tests a theory by checking specific data; its results depend on how correct the starting assumptions are
Combining Inductive and Deductive Research
Larger studies often start inductively (develop theory) and follow with deductive research (test theory).
The theory developed from inductive reasoning becomes the starting point for deductive research.
/Researchers first discover ideas from data (inductive), then test those ideas with more data (deductive) to confirm or improve them
Frequently Asked Questions
What’s the difference?
Inductive = bottom-up (specific → general).
Deductive = top-down (general → specific).
What is inductive reasoning?
Drawing conclusions from specific observations to general conclusions (inductive logic).
What is deductive reasoning?
Drawing specific conclusions from general premises (deductive logic).
/Inductive = from specific facts to general ideas.
/Deductive = from general ideas to specific facts.