The cross-referencing technique solves all organizational problems. Misplacements must be corrected by cross-referencing, not by rearranging.
This is particularly true when other cross references on paper can't easily be found and fixed the way they might be in digital form. Creating a pointer to the correct location is the quickest and most efficient method for fixing a mis-filing on paper.
is essential in subject work becausesome subjects are closely related andyet not sufficiently so to be filed to-gether.
The use of the cross reference sheet
A portion of the reason why Luhmann chose a duplex numeric filing system for his zettelkasten.
ne of the chief drawbacks in using the Alpha-betic and Numeric systems in conjunction with asubject file is that in handling a large amount ofmaterial a great deal of cross referencing has tobe done, causing much extra labor and filling upthe files.
drawbacks of alphabetic and numeric systems with respect to cross referencing