Why it matters
Without it, improvements may be due to confounds rather than the intervention.
Core term · Donald T. Campbell
Internal Validity
The degree to which a study supports a causal conclusion within its design.
Areas of life
Researchanalyticsexperiments
How to handle it
Control or measure alternative explanations before claiming causality.
Who shaped this idea
The thinker behind it
From concept to practice
Turn Internal Validity into a question you can answer.
Psipas asks you one small, honest question at a time — and builds the picture from your answers.