Use the following pieces of context to answer the question at the end.
If you don't know the answer, just say that you don't know, don't try to make up an answer.
When answering questions about the main topics or themes, try to identify common subjects across the documents.
Provide specific information and avoid vague responses.

Context:
. We captured basic information from each document (e.g., title, author[s] and publication date) and a broad description of each document’s substance (e.g., methods, strategies, metrics and relation to our research questions). We used the substantive descriptions to select 50 articles for a more thorough M Shannon Kugley, Anne Wade, James Thomas, Quenby Mahood, Anne-Marie Jrgensen, Karianne Hammerstrm and Nila Sathe, “Searching for Studies: A Guide to Information Retrieval for Campbell,” Campbell Systematic Reviews , February 13, 2017. review and analysis

. We used online databases to search and catalog an initial sample of 100 articles related to revitalization, activating public spaces, making public spaces and strategies for revitalization. Our team identified 109 abstracts, including dissertations, websites, foundations’ program reports and peer-reviewed studies, including several literature reviews over the last 20 years. We captured basic information from each document (e.g., title, author[s] and publication date) and a broad description of each document’s substance (e.g., methods, strategies, metrics and relation to our research questions)

. review and analysis. During the in-depth review, articles that we determined did not contribute to our research questions were dropped from the sample and additional articles were identified. We also found that a handful of strong, related articles did not match our inclusion and exclusion criteria, primarily based on the country in which the research was conducted. We decided to keep most of these articles, as they built on research conducted in the United States; sampled English-speaking, democratic populations; or contained a detailed review of the literature

. They also compare how representative downtown residents and workers are of the broader city.43, 44 Sector-focused Metrics Metrics focused on the health of the housing and business sectors were most frequently used to describe the markets of the respective sectors

. City-Specific Findings The communities included in this study encompass an array of different densities, demographic mixes and economic trajectories, much of which are driven by citywide or even regional trends. These communities were chosen not because they are a representative sample of cities across the U.S. but because they are commu- nities where Knight has invested

BY AARON WIENER | APRIL 2019 How Five Cities Reimagined Their Public Spaces Common Goals, Different Approaches

. The review focused on three bodies of literature— literature focused on downtown revitalization (revitalization),D equitable economic development, and public space creation and activation.E The specific focus on separate bodies of literature for revitalization and equitable economic development was necessary because traditional revitalization practices and literature rarely consider how strategies and their outcomes may benefit or harm different groups and constituents

33 Appendix A Exhibit A.1 Inclusion and Exclusion Criteria for Literature Review POPULATIONS Within United States Narrow to similar size of city Narrow to neighborhoods and center-city downtowns Articles published since 2000 Residents who live, work and play in focus areas Employees who work in focus areas Property owners in focus areas Business owners in focus areas Operators of public spaces Entrepreneurs in focus areas INTERVENTIONS Attention paid to development that uses: 1. Public spaces to revitalize 2. Community engagement or inclusive planning for revitalization 3. Equitable economic development (e.g., infrastructure development) for revitalization 4

Question: are the common topics the papers are based on

Provide a comprehensive and specific answer based only on the given context: