Use when deciding what belongs in a TACAS (ETAPS) paper body versus its appendix, supplementary website, and artifact, covering the 16-page (or 6-page) llncs.cls budget that excludes references and appendix, the rule that decision-critical content stays in the reviewed pages, category-appropriate anonymity of supplementary material, and how to split a verification paper between body, appendix, and a mandatory-or-voluntary artifact.
