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4

Quantitative methods ...

2. Controlled experiments

The traditional scientific method

reductionist

clear convincing result on specific issues

In HCI:

insights into cognitive process, human performance limitations, ...

allows comparison of systems, fine-tuning of details ...

Strives for

lucid and testable hypothesis (usually a causal inference – hence, inferencial statistics)

quantitative measurement

measure of confidence in results obtained replicability of experiment

control of variables and conditions

removal of experimenter bias

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