The document discusses the characteristics of "90/90/90 schools", where 90% of students are eligible for free or reduced lunch, 90% are ethnic minorities, and 90% meet high academic standards. It identifies several common factors of successful 90/90/90 schools, including a strong focus on data-driven student achievement, collaborative teacher work, effective school leadership, and curricula emphasizing non-fiction writing and common assessments. Research shows student demographics are less important than classroom strategies, teacher quality, and collaboration in driving student success.