Intensive Outpatient Treatment (also known as IOP for Intensive Outpatient Program) is a primary treatment program recommended in some circumstances by a clinical and medical assessment. IOP may be recommended for those who do not need medically-supervised detox.
The genitive is the case (or function) of an inflected form of a noun or pronoun showing ownership, measurement, association, or source. Adjective: genitival. The suffix -'s on nouns is a marker of genitive case in English. Genitive case can also be indicated by an of phrase after a noun.
An infinitive is the simple present form of a verb used as either a noun, adjective, or adverb. The verb of the infinitive is normally preceded by the word to. When the infinitive follows some verbs as the direct object, the to may be dropped. An infinitive phrase is the infinitive plus any complements and any modifiers of the infinitive and complements. As a Noun: He helped to write the program. As an Adjective: Lydia was looking for a way to earn money. As an Adverb: He shouted to get our attention. To Dropped: He helped write the program.