2.5.1.3. Section 3: Capability Discussion. Same as the regular CDD with the exception of the following:

2.5.1.3.1. Provide a table that briefly describes the contribution this IS-CDD makes to the fulfillment of CR described in the applicable ICDs or analysis of the capability gaps as illustrated in Figure B-15.

For reference or comparison, below is what the JCIDS Manual says for the CDD 2021 itself:

2.5.3.2. Summarize all related analyses and/or studies conducted to derive the performance attributes (KPPs, KSAs, and APAs) presented later in the CDD. Ensure the summary includes any intelligence analyses considered. Include the alternatives, objective, criteria, assumptions, recommendations, and conclusion. Ensure that final reports, or other resulting products, of studies or analyses not already present in KM/DS are uploaded for Reference purposes.