Researchers and evaluators interested in positive youth development (PYD) programs seek to understand what works for what youth in what ways. Typically, measurement and analysis are framed by ergodic theorems, which assume homogeneity of individuals and stationarity in individuals' developmental pathways. However, such commonality (homogeneity and stationarity) does not characterize all developmental data sets. Here, we interrogate ergodicity assumptions using data from the Compassion International (CI) Study of PYD in El Salvador. We assessed 1205 youth (M_age = 13.03; 49.8% female; 67.1% urban), 51% of whom were enrolled in CI-supported programs, regarding links among youth strengths, contextual resources, and program outcomes. We replicated analyses across specific subgroups (urban-rural, gender, and CI-enrollment status) to determine which findings were robust (demonstrating commonality) and which findings were unique (demonstrating specificity). Instances of commonality and specificity characterized many relations. Implications for designing and enhancing developmental programs are discussed.

对积极的青年发展（PYD）计划感兴趣的研究人员和评估人员试图了解哪种方式以何种方式对哪些青年有效。通常，测量和分析是由遍历定理构架的，这些定理假设了个体的同质性和个体发展途径的平稳性。但是，这种通用性（同质性和平稳性）并不代表所有发展数据集。在这里，我们使用来自萨尔瓦多PYD的Compassion International（CI）研究的数据来询问遍历性假设。我们评估了1205青年（中号_年龄 = 13.03; 女性49.8％；67.1％的城市人口），其中51％的人参加了CI支持的计划，这涉及到年轻人的力量，背景资源和计划成果之间的联系。我们在特定亚组（城市，农村，性别和CI注册状态）之间重复了分析，以确定哪些发现是可靠的（证明共同点），哪些发现是独特的（证明特异性）。共有性和特殊性的实例表征了许多关系。讨论了设计和增强开发程序的含义。