This is the 5183rd most frequent Russian word.
необходимой
Necessary.
In this sentence, 'необходимой' describes the type of information that is needed for the project.
Для успешного завершения проекта требуется подробная проработка необходимой информации.
For the successful completion of the project, a detailed review of the necessary information is required.
In this case, 'необходимое' relates to the essential items required for the trip.
Она купила всё необходимое для путешествия.
She bought everything necessary for the trip.
Here, 'необходимой' modifies 'подготовки', indicating that specific preparation is crucial.