Perusteisessa

Perusteisessa is the inessive singular form of the Finnish adjective perusteinen, used to describe something that is based on a basis or principle. In Finnish grammar, adjectives agree with the noun they modify in number and case, so perusteisessa signals that the entity in question is guided by a certain foundation or set of criteria. The word derives from peruste, meaning basis or foundation, with the common -inen suffix forming the adjective.

Usage and contexts: The term appears primarily in formal or technical writing, policy texts, and educational or research contexts. It conveys that decisions, plans, or analyses are anchored in predefined bases or criteria. Examples include phrases like perusteisessa koulutuksessa, perusteisessa tutkimuksessa and perusteiden mukaan, where the approach or content is tied to a specified foundation.

Examples:

- Perusteisessa koulutuksessa opetussuunnitelma ja oppimateriaalit rakennetaan perusteiden mukaan.

- Perusteisessa tutkimuksessa tutkimusasetelma ja analyysit pohjautuvat ennalta määrättyihin perusteisiin.

- Perusteisessa suunnittelussa päätökset tehdään perusteiden perusteella.

Related forms and distinctions: Perusteinen can be contrasted with perusteellinen, which more often means thorough or comprehensive rather than strictly “based on.” The adverbial form perusteellisesti refers to doing something thoroughly, while perusteellisesti can be used in contexts that emphasize depth rather than basing on criteria. Finnish also uses phrases like perusta ja perusteiden mukaan to express grounding in specific foundations.

See also: peruste, perusteellinen, perusteellisesti, perusteien mukaan. These terms share the idea of foundations, criteria, or grounds that guide interpretation, evaluation, or action.