Please write some form of discussion, comparison, differences and/OR definition for the

Please write some form of discussion, comparison, differences and/OR definition for the below listed topics. Each response only needs to be between 100 -250 words for each topic, and not a goggle search response. The only "must have" in each, is an example. 

The responses/answers will be ran through a plagiarism check, so they must be authentic. 

Exploratory studies 
• Qualitative techniques

• Secondary data analysis

• Experience survey vs. Focus groups

• Two-stage design