atree or Binary Ahnentafel method uses the same numbering of nodes in the binary ancestors tree as Ahnentafel method, but uses binary letters or numbers instead. The advantage of atree system is easier understanding of the genealogical path (as a path from the subject) and binary numbering system is natural for the binary tree.
Below are samples showing the first fifteen binary nodes is this type of system.
The general description of the atree - Binary System at the top of the page, and the sample generic chart on the left above is adapted from Wikipedia: Genealogical Numbering Systems. The sample Higdon chart on the right is adapted from the genealogical register report starting on page 263 of Descendants of John Higdon and Millicent 1657-1998, by Gena Lee Theiss.
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