What should the drug product Quality Overall Summary explain beyond the composition table?

The QOS should function as a scientific argument, not merely repeat Module 3 headings. It should connect the Quality Target Product Profile to the critical quality attributes, explain why development decisions were made, show how the manufacturing process and controls assure performance, justify specifications, address container-closure and extractables/leachables considerations where relevant, and establish the scientific basis for shelf life. When these relationships are not clear, reviewers must reconstruct the rationale themselves, increasing the likelihood of questions, inconsistencies, or deficiencies.