To help policy makers make practical programmatic design choices, the "Evidence at Your Fingertips Series" explains how the design of cash transfer programs can affect outcomes. The review is largely based on impact evaluations published in the past decade. The series is launched with an initial set of five thematic briefs on benefit size, timing (frequency and duration), transfer modality (cash versus in-kind), payment mechanism (physical versus digital), and gender. While the impacts of cash transfers can vary depending on the context, this overview brief aims to present key take aways on how design features can impact cash transfer outcomes. Evidence at Your Fingertips Series: • Evidence Briefs on Cash Transfers: Overview and Ten Key Messages • Cash Transfer Size: How Much Is Enough? • Cash Transfer Timing: How Transfer Duration and Frequency Contribute to Outcomes? • Cash Transfer Payment Mechanisms: Do Outcomes Vary According to Payment Mechanism? • Cash or In-Kind Transfers: Do Outcomes Vary According to Transfer Modality? • Can Safety Nets Reduce Gender-Based Violence? How?