RESEARCH NOTE Numbering Formats for Hierarchic Lists
研究了人们扫描层级编号列表时的表现，发现完整编号格式有助于定位单个项目，而隐式编号格式在感知列表结构方面同样有效甚至更优。
People scanned lists of hierarchically numbered items in order to perform various tasks. For tasks involving location of individual items, a list of format with complete numbering resulted in superior performance. For tasks requiring perception of list structure, an alternative format with implicit numbering was equally good if not better.