This document summarizes the results of several surveys on agile software development practices. It finds that the most commonly used and effective agile practices include continuous integration, daily stand-up meetings, developer test-driven development, and iteration planning. The surveys also show that agile approaches have higher success rates than traditional approaches across criteria like functionality, quality, time, and budget. Additionally, the document discusses challenges with agility at scale, adoption rates of agile, practices around estimation and project management, and the use of modeling and documentation in agile projects.