Research Design

Different participants in each group. One group does a task with an audience whilst another group does the task alone.

Advantages;

• No order effects, no one gets better through practice or gets worse through being bored or tired. 

Disadvantages;

• Participant variables, differences between the people in the group could effect the results as some may be better at the task than others
• Twice as many participants are needed

All the particiapants do both tasks, you can then compare the performances/scores from each condition

Advantages;

• There is no participant variability as the participants are used twice, once in each condition so any differences shouldn't affect the results
• Fewer participants are needed to get the same results.

Disadvantages;

• Order effects, as the participants do one condition first, they might do better in the second condition as they have already had practice in the first condition.

Different participants in each condition but they are matched on skill level, intelligence, gender etc etc.The results are then compared between the pairs.

Advantages; 

• No order effects, there are different people in each condition so no one would have the opportunity to practice.
• Participant variability, important differences are minimised through matching the participants.

Disadvantages;

• Twice as many people are needed for the same amount of results.
• Time consuming.
• Difficult to find participants who match up appropriately.