Experimental Design (Repeated Measures, Independent groups..)

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Repeated Measures Design

1 group

Each participant subject to every condition

Advantages

Cheap

Quick

No participant variation

Disadvantages

Order effects

Purpose of experiment may be revealed

Boredom effect

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Independent Groups Design

2 (+) groups that complete different tasks

e.g. Group 1 completes task with music, Group 2 without music

Advantages

No order effects

No boredom effect

Participants unlikely to discover experiment purpose

Disadvantages

Open to participant variation (e.g. ability)

Costly due to more participants

Open to experimenter bias if group allocation isn't random

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Matched Pairs Design

2 (+) Groups

Participants are matched into each condition as closely as possible based on important factors (e.g. age, gender)

Advantages

No order effects

Reduced participant variation

Participants unlikely to discover experiment purpose

Disadvantages

Time consuming

Hard to decide which characteristics to match