ILSs (Instrument landing systems) -- See Instrument landing systems Here are entered general works on systems of landing aeroplanes by instruments when visibility is low or practically nonexistent, and also works on the specific system known as ILS (instrument landing system). Works on other individual systems are entered under specific headings, e.g. Ground controlled approach.
ILSs (Integrated learning systems) -- See Computer-assisted instruction Here are entered works on an automated method of instruction in which a student interacts directly with instructional materials stored in a computer. Works on the use of computers to assist teachers and administrators in coordinating the instructional process, e.g. retrieving and summarizing performance records and curriculum files, are entered under Computer managed instruction. --subdivision Computer-assisted instruction under topical headings, e.g. Chemistry--Computer-assisted instruction and subdivisions Computer-assisted instruction, Computer-assisted instruction for foreign speakers, and Computer-assisted instruction for French, [Spanish, etc.] speakers under individual languages, e.g. English language--Computer-assisted instruction