NSTD.5:5.3 - Engagement device selection matrix

Device	Buys	Risk	Repair when the risk occurs
Tension	Keeps attention across uncertainty.	Reads as a settled explanation.	Make the unresolved question and the source’s actual result visible.
Failure story	Makes misuse vivid.	Becomes blame or proof by anecdote.	Distinguish a constructed case from a reported event, and retain the condition the case illustrates.
Analogy	Makes an abstract relation easier to follow.	Replaces a definition or proof.	State the limiting condition and make the required formal statement available.
Character viewpoint	Improves salience.	Misattributes consequential action or responsibility.	Clarify that attribution through `NSTD.4`; clear ordinary personification needs no extra repair.
Surprise reveal	Supports memory and curiosity.	Hides a needed source constraint from the writer as well as the reader.	Restore the missing condition through `NSTD.1`, or repair its presentation order through `NSTD.2`. With the condition and order already available, try the scene directly.
Humor or style	Can make a passage easier to approach or remember.	Loses a distinction needed for the later use.	Restore that distinction; use `C.2.LS`, `A.6.3.CSC` or `E.10` only for the unresolved language, coarsening or precision question.