GCCCD Research Methodology Used by Matthew Desmond Questions

I need support with this Sociology question so I can learn better.

Describe the research methodology Matthew Desmond used for his book “Evicted.”

1. Is his methodology scientific? 

You may review the following sources of information:

• Forced Out: For many poor Americans (Links to an external site.)Links to an external site. 
• Evicted: Poverty and Profit (Links to an external site.)Links to an external site.
• Watching Families Loose their home (Links to an external site.)Links to an external site.
• Unstable Housing  (Links to an external site.)Links to an external site.