perusteissa

Perusteissa is the inessive plural form of the Finnish noun peruste, which means base, foundation, criterion, or justification. In Finnish grammar, the inessive case (-ssa/-ssä) marks location or context, so perusteissa translates roughly to “in the bases” or “in the foundations.” In practice, the form is common in formal language to indicate that something rests on, is described by, or should be interpreted from the bases, guidelines, or criteria laid out in a text.

The term is frequently encountered in legal, educational, and administrative writing. In education, for example, national or local curricula and standards are described as the perusteet, and discussions may refer to them as the sources of objectives or requirements. In regulatory or policy documents, statements or decisions are often said to be grounded in or based on what is stated "perusteissa."

Examples of usage include sentences such as: “Koulutuksen perusteissa on määritelty oppimisen tavoitteet” and “Päätökset tehtiin perusteissa mainittujen kriteerien mukaan.” These illustrate how perusteissa signals that the content derives from the official bases rather than from informal or external criteria.

Nuances: perusteissa emphasizes the source or foundation within a written document, rather than describing the content of the bases themselves. It can be contrasted with phrases like “perusteiden mukaan” (according to the bases) or “perusteiden perusteella” (on the basis of the bases).

See also: peruste, perusteet, perustelu, perustuva.