The WO-ISA provides the applicant with a preliminary, non-binding opinion on the issues of novelty, inventive step and industrial applicability. This allows the applicant to assess, already at the search stage, whether to proceed directly
to the national/regional phase. For this or to file a demand under Chapter II PCT in order to overcome objections raised in the WO-ISA
and other reasons, in some cases international preliminary examination may have no added value (see points 300 ff). Thereforepossibly receive a positive IPER. However
, before taking a decision on filing a demand for international preliminary examination, applicants are advised to consider carefully the information regarding the usefulness of the procedure under Chapter II PCT (see points 291 ff).