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If you are looking for the Common Approach website, head to www.commonapproach.org.
If you're specifically looking for information on the Common Impact Data Standard, you can find that at https://www.commonapproach.org/common-impact-data-standard/.
If you are looking to download the Common Impact Data Standard OWL file, click http://ontology.commonapproach.org/owl/cids_v2.1.owl to initiate the download.