It depends on the type of data you need to organize, but I imagine that an alphabetical system is likely the most popular in most cases.
The alphabetical filing system is the most common one used.
Windows XP was the most popular operating system.
the most popular operating system multitasking is kernel
The most popular marketing information system is the marketing information system that is the most widely used. This system is used widely due to its popularity.
A medical record technician manages medical records. Most of their time is spent scanning, filing and organizing these records. They may have to help customers or answer the phone as well.
binary code system
the most popular system of government is the unity system, in which there is no regional representation just a national government (like in a federal system), and the national government holds most of the power
RSA
The most popular system in use is Quicken, which has been around for several years. There are several new-comers on the scene. The most popular are "You need a Budget", Outbright, and Mint.
There really is no most popular. it depends on what games you like.
Xbox 360
iOS