Data Collection and analysis

For your planned research design, what type of data will you need and what data collection tools and sources will provide it?
For my planned research design, I will need 
What specific data points from these sources will you need to answer your research question(s)?
 
What limitations, challenges, and/or barriers might you need to address while conducting this study (e.g., access to participants, access to data, requirements for storing data, separation of roles or other ethical considerations, instrumentation fees, etc.)?