試行

1. Origins, structure, and basic meaning

• Structure: 試行（しこう） means trying out a method or system. Connect the idea of trying in 試 with carrying something out in 行.
• Basic usage: It is used for repeated trials, as in 何度か試行して, or initial operation in a limited area, as in 一部の地域で試行される.

2. Common pitfalls and similar expressions

• A different word with the same reading
  • 施行（しこう） is used for putting laws or systems into effect, whereas 試行（しこう） emphasizes trying something out. Even a new system can be described with 試行 when it is being operated on a trial basis, as in the second example.
• Execution used to assess results
  • In the first example, several trials precede the choice of an efficient procedure. Read 試行 as trying something to assess the method, not merely carrying out a task.