Article 8 Information Concerning the Existence of Administrative Documents When non-disclosure information will be released by merely answering whether or not administrative documents concerned with a disclosure request exist or do not exist, the head of an administrative organ, without making clear the existence or non-existence of the documents, may refuse the disclosure request. Article 9 Measures Concerning Disclosure Requests 1. When disclosing all or a part of the administrative documents concerned with a disclosure request, the head of the administrative organ shall make a decision to that effect, and notify the requester to that effect in writing as well as of matters determined by Cabinet Order relating to the implementation of disclosure. 2. When not disclosing any of the administrative documents concerned with a disclosure request (Including when refusing the disclosure request in accordance with the preceding Article, as well as when administrative documents concerned with the request are not held.) the head of the administrative organ shall make a decision to the effect of non-disclosure and notify the requester to that effect in writing. Article 10 Time Limit for Disclosure Decisions, Etc. 1. The preceding Article's decisions (Hereinafter referred to as "disclosure decisions, etc.") shall be made within thirty days after the day of the disclosure request. However, in the case that a revision is requested as provided for in Article 4, paragraph 2, the number of days required for the revision shall not be included within this time limit. 2. Notwithstanding the preceding paragraph, when there are justifiable grounds such as difficulties arising from the conduct of business, the head of the administrative organ may extend the time limit provided for in the same paragraph for up to thirty days. In this case, the head of the administrative organ shall without delay notify the requester in writing of the extension period along with the reason for the extension. Article 11 Exception to the Time Limit for Disclosure Decisions, Etc. In the case that there is a considerably large amount of administrative documents concerned with the disclosure request, and there is a risk that by making disclosure decisions, etc. for all of them within sixty days of the disclosure request the performance of duties will be considerably hindered, notwithstanding the preceding Article, it shall be sufficient if the head of the administrative organ makes disclosure decisions, etc. for a reasonable portion of the administrative documents concerned with the disclosure request within the said period of time, and if disclosure decisions, etc. are made for the remaining administrative documents within a reasonable period of time. In this case, the head of the administrative organ shall within the period of time provided for in the first paragraph of the same Article notify the requester in writing of the following items: (1) The application of this Article and the reason for its application. (2) The time limit for making disclosure decisions, etc. for the remaining administrative documents.