Association For Computing Machinery – keywords

These keywords are found on research papers and help to classify them. This ensures accurate categorisation and helps readers to retrieve related material when carrying out research. It also makes sure the paper is placed correctly when a review appears in Computing Review.

ACM features
A Four Level Tree with Three Coded Levels and (usually at the 4th Level) category containing uncoded subject descriptors.

The following example is given on the website:

“Example:

Categories: H. INFORMATION SYSTEMS

H.2. DATABASE MANAGEMENT

H.2.3 Languages

Subject descriptor: Query languages”

Source:
http://www.acm.org/about/class/ccs98-intro
This link gives an introduction to the 1998 ACM Computing Classification System which is currently in use today.