Final answer:
A directive suited for manuals with parts, chapters, or sections is a Manual Directive, which organizes detailed information in a structured reference format.
Step-by-step explanation:
The type of directive that is an instruction or notice whose size and content is best suited to a format used for manuals consisting of parts, chapters, or sections is a Manual Directive. Manual Directives are typically comprehensive documents that provide detailed instructions, guidelines, or procedures which need to be organized in a structured way. Unlike a simple memo or brief notice, a manual is designed to be a reference tool that can be consulted as needed, usually comprised of multiple components that address complex or numerous aspects of a particular subject or operation.