Who decides on the final form of the ballot text?

Law 8492 Referendum regulations (Decreto 8492 para laRegulaci?n del refer?ndum) arts 6.b), 12.a) and 13.a)

http://aceproject.org/ero-en/regions/americas/CR/costa-rica-decreto-8492-para-la-regulacion-del

The texts submitted by the legislature or thePresident are not subject to any review, but those submitted by a citizens or agroup of citizens need to be reviewed and, if the case, amended by theTechnical Services Department of the Legislature.