立案

1. Origins, structure, and basic meaning

• Structure: 立案 is read as りつあん and can mean “planning” or “drafting”, depending on context.
• Basic usage: The examples show an evacuation plan drafted by a team and a new system shaped by field feedback.

2. Common pitfalls and similar expressions

• Distinguishing senses and uses
  • It is drafting a concrete plan, policy, or system at the design stage, before implementation 実施.