{"id":1652,"date":"2026-10-06T12:28:30","date_gmt":"2026-10-06T12:28:30","guid":{"rendered":"https:\/\/dev.ich.org\/index.php\/guidelines\/q1d\/"},"modified":"2026-10-06T12:28:30","modified_gmt":"2026-10-06T12:28:30","slug":"q1d","status":"publish","type":"guideline","link":"https:\/\/dev.ich.org\/index.php\/guidelines\/q1d\/","title":{"rendered":"Q1D \u2013 Bracketing and Matrixing Designs for Stability Testing of New Drug Substances and Products"},"content":{"rendered":"<p>The ICH Harmonised Guideline was finalised under <em>Step 4<\/em> in February 2002. This document is intended to address recommendations on the application of bracketing and matrixing to stability studies conducted in accordance with principles outlined in the main stability Guideline.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The ICH Harmonised Guideline was finalised under Step 4 in February 2002. This document is intended to address recommendations on the application of bracketing and matrixing to stability studies conducted in accordance\u2026<\/p>\n","protected":false},"featured_media":0,"template":"","guideline_category":[18],"guideline_tag":[],"rd_phase":[],"class_list":["post-1652","guideline","type-guideline","status-publish","hentry","guideline_category-quality"],"acf":[],"_links":{"self":[{"href":"https:\/\/dev.ich.org\/index.php\/wp-json\/wp\/v2\/guideline\/1652","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dev.ich.org\/index.php\/wp-json\/wp\/v2\/guideline"}],"about":[{"href":"https:\/\/dev.ich.org\/index.php\/wp-json\/wp\/v2\/types\/guideline"}],"version-history":[{"count":0,"href":"https:\/\/dev.ich.org\/index.php\/wp-json\/wp\/v2\/guideline\/1652\/revisions"}],"wp:attachment":[{"href":"https:\/\/dev.ich.org\/index.php\/wp-json\/wp\/v2\/media?parent=1652"}],"wp:term":[{"taxonomy":"guideline_category","embeddable":true,"href":"https:\/\/dev.ich.org\/index.php\/wp-json\/wp\/v2\/guideline_category?post=1652"},{"taxonomy":"guideline_tag","embeddable":true,"href":"https:\/\/dev.ich.org\/index.php\/wp-json\/wp\/v2\/guideline_tag?post=1652"},{"taxonomy":"rd_phase","embeddable":true,"href":"https:\/\/dev.ich.org\/index.php\/wp-json\/wp\/v2\/rd_phase?post=1652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}