Practical, Ethical and Theoretical Issues.

Practical Issues include:

• Time
• Cost
• how easy to study subject with particular method. 
• Depth of info from data.

Ethical Issues include:

• informed consent
• confidentiality
• harm to participants.

Theoretical Issues include:

• Validity - does it show a true picture of what its like.
• Reliability - If repeated would it give similer results.
• Is the sample represantative.

Consider factors like the hawthorne effect. This is where if people know they…