In linguistics, the comparative method is a standardized way to compare different languages in order to determine their relationship to one another. The comparative method is based on the principle of regular sound change, which holds that any changes in the sounds of a language that happen over time occur in a regular way, with no exceptions. Languages are analyzed using the comparative method to determine whether they share a common mother language, a single language from which several others evolve. The comparative method can also suggest which branches of a language family developed earlier or later in time.
Comparative linguistics
phonetical
lexical
Morphological and syntactic
ASPECTS OF COMPARATIVE LINGUISTICS
Comparative linguistics
Synchronic (linguistics)---languages are studied at a theoretic point in time: one describes a ‘state’ of language, disregarding whatever changes might be taking place.
Diachronic----languages are studied from point of view of their historical development – for example, the changes which have taken place between Old and Modern English could be described in phonological, grammatical and semantic terms.
1) descriptive; 2) experimental; 3) statistic; 4) transformational 5) substitutional; 6) intermediate and ultimate constituents analysis; 7) inductive (comparing language data on the ground of certain criteria); 8) deductive (working out criteria for comparison) methodology.