Orthogonal design affords an opportunity to design interventions in real-world settings and to study intervention components that can be implemented in various ways. This issue brief introduces orthogonal design, describes key design and implementation considerations, and illustrates how it can...

Social network analysis, a methodological approach to measuring and mapping relationships, can be used to study whole networks, all of the ties within a defined group, or connections that individuals have in their personal communities. This brief introduces the concepts behind SNA and...

Orthogonal design affords an opportunity to design interventions in real-world settings and to study intervention components that can be implemented in various ways. This issue brief introduces orthogonal design, describes key design and implementation considerations, and illustrates how it can...

Reports initial findings from a synthesis and reanalysis of all available evidence on whether quasi-experimental evaluation designs produced unbiased estimates of the impacts of education, training, and welfare programs. This methodological paper tries to understand conditions under which...

Social network analysis, a methodological approach to measuring and mapping relationships, can be used to study whole networks, all of the ties within a defined group, or connections that individuals have in their personal communities. This brief introduces the concepts behind SNA and...