Usage patterns
〈事〉を骨子とするto make X the core point (of a plan or proposal)
This reform proposal is built around making administration more efficient.
骨子を固めるto firm up the main framework (of a plan)
At the meeting, they solidified the framework of the new policy.
骨子をまとめるto compile the gist/outline (of a report or document)
The committee put together the main points of the report.
骨子を示すto present the outline/main points (of a bill or plan)
The minister presented the main points of the new bill.