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.
1 is formed with a prepositional phrase using of (the end of the road) or 's (Land's End) . 2  A singular genitive noun is marked by an apostrophe and an s (Jack's) . 3  A plural genitive noun is marked by a final apostrophe (Jameses') .