Genealogy Numbering Systems

Numbering systems for ancestors follow standard patterns:

Numbers go back from an individual (#1) with the male numbers being even and the female numbers odd. If I am #1, my father is #2, my mother#3. My paternal grandfather #4 my paternal grandmother #5... etc. Often the lineage is laid out on a pedigree chart, but it may be a simple listing, with each line numbered. This numbering system is called an ahnentafel (or Sosa-Stradonitz)

Numbering systems for descendants vary more substantially, but most genealogies now adhere to one of two similar systems: The Register System or the Modified Register/NGS system. There are versions of another system, called the Henry System used in some published genealogies. And genealogists keep trying to invent new and better systems... but there is no perfect system and in the case of genealogical writing, variety breeds confusion.

Books, articles, CD's, tapes etc.
On the Web...

Curran. Numbering Your Genealogy: Basic Systems, Complex Families and International Kin.

William Dollarhide covers numbering system in his book Managing a Genealogical Project... and he also breaks the cardinal rule of genealogy and invents one of his own.

For a very thorough explanation of numbering systems, see Pence. Numbering Systems in Genealogy. and Additional Notes

There is a rootsweb message board devoted to the subject of numbering systems.

Dollarhide. Descendancy Numbering Systems.
Dollarhide. An Awful Ahnentafel
Dollarhide. The Henry System

Anderson. Ahnentafel numbers are not as mysterious as they seem.

Willard. Deciphering the Register Numbering System.

Some people just have to make up their own weird numbering system.

Mark Forkheim explains his system... and why he developed it.