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Grammatical aspect presents a temporal view of an event or state, for example as ongoing or as a whole. It concerns how the event is viewed, whereas grammatical tense concerns its relation to a temporal reference point. Affixes and auxiliary constructions can express aspectual distinctions.^[ref]

Compare “The train arrived” with “The train was arriving”. Both locate the situation in the past, but the second presents an unfolding situation and does not by itself assert a completed arrival. Comparing “is arriving” with “was arriving” instead changes tense while retaining the progressive construction. Such contrasts help isolate which part of an interpretation comes from each grammatical choice. A formal semantics can encode those differences explicitly, rather than treating every temporal expression as the same kind of label.

SIL International is a language-focused organization whose name appears as the publisher of linguistic reference materials and software documentation. Its glossary distinguishes concepts such as grammatical tense, which locates a situation relative to a reference time, and grammatical aspect, which describes its temporal presentation.^[ref][ref]

Its language-technology work includes FieldWorks Language Explorer, software for organizing lexical entries, analyzing texts and describing grammar. An investigator can connect an observed word form with an analysis into morphemes, then compare that analysis across further recorded examples. Such tools make a proposed linguistic morphology inspectable; the stored analysis still needs evidence from language use.^[ref]