Genre — Science Fiction: Soft SF
Soft SF is not Hard SF with the numbers filed off. Its physics is kinship, law, and the word you are not allowed to say, and the model will refund all three the moment the scene wants to be tender.
Harry Mercury
Editor in Chief
In "Novel II — Worldbuilding: Maps, Timelines, Glossaries" I said Hard SF is the second witness with homework: mass, delta-v, a number a certain kind of reader will check. Soft SF is not the holiday from that homework. It is homework of a different kind, and it is the kind the model fails more quietly, because the failure sounds like literature.
The publishing axis is a convenience. Hard SF lets the universe disagree in units. Soft SF lets a culture disagree in kinship, law, language, and the word you are not allowed to say. Both are physics. One of them looks like anthropology, so writers and models treat it as mood. Mood is how a caste system becomes wallpaper.
By the end you should be able to hire a social constraint the way you hired a well, catch the moment the model refunds it for tenderness or clarity, and tell a culture that costs from a brochure that has pronouns.
Soft Is Not Vague
The cheap definition is that Hard SF is engineering and Soft SF is people. That definition has ruined more drafts than it has helped. The Left Hand of Darkness is not vague. Kemmer is a cycle with a cost. Shifgrethor is a politics you can violate. Winter is not a theme you lift for the travel chapters; it is how Karhide stays itself. Le Guin did not file the numbers off a spaceship. She built a social physics and then refused to refund it when Genly Ai wanted to be understood.
Butler does the same with blood. Kindred is time travel only as a delivery system. The constraint is kinship under a law that does not care what century Dana thinks she is from. Delany's Babel-17 treats language as a tool that cuts the speaker. You cannot have that novel if interiority is allowed to translate every hard word into English the moment a character needs to be clear. Clarity is the refill Soft SF is most ashamed of, because it looks like kindness to the reader.
I am not arguing that Soft SF is better than Hard SF. I am arguing that it is stricter than the name admits. Hard SF's reader will catch a wrong orbit. Soft SF's reader will catch a marriage that could not have happened, a title used as a nickname, a taboo that lifted because two people were in a room. They will not name the problem as "worldbuilding." They will name it as the book going soft. The pun is accidental and accurate.
In "Genre Calibration: Training AI for Fiction vs Non-Fiction" I said the model has priors for genre furniture. Ask for science fiction and you will get a Council, a caste, a festival, and a belief system explained in the first three pages. That is not Soft SF. That is a brochure with a social register. Soft SF begins when the institution wants something on page twelve and still wants it on page three hundred, including during the love scene.
The Brochure with a Caste System
Here is the AI accent of fake Soft SF, and it is more specific than "the model doesn't understand culture."
The model is fluent in the sound of anthropology. It has read a thousand pages in which someone says, "In this world, the people of the valley believe." Belief, in the training data, is flavor. Flavor is texture that has not been used. Unused texture is allowed to drift. A generated caste system will be mentioned so that it can be escaped. The protagonist will be the exception. The taboo will be acknowledged in a sentence and then refunded by a hidden cousin, a special license, a night when the rules sleep. You hired a cost. A scene that spends the cost and then refunds it has no cost.
Taboo holiday. The unspeakable is spoken because the scene is intimate, or the character is having a breakthrough. Interiority, in the corpus, is where truth lives. If your town wants the accident unspoken, the model will name it in thought and call that honesty. You hired a politics of speech. Honesty that ignores the politics is a different country.
Translation. The hard word is rendered into English so the reader will not have to work. Friday's glossary already named this: "the evening bell" for the mill whistle. Soft SF does it with kinship. Mother, aunt, wife, owner: if those are the same person in this book, the model will still split them because the love scene, in the prior, needs a private pair.
Exceptional protagonist. The rule is real for everyone except the viewpoint. This is the cheap move I named in "Novel II — Worldbuilding: Consistency Engines": the desert had a river under it; the magic costs nothing if you are special. Soft SF's version is the envoy who learns the language in a week, the heretic the institution cannot touch. A caused exception is plot. An uncaused one is a hat.
Completeness ethnography. You asked for a chapter, so the model supplies a functioning culture: a market, a marriage custom, a funeral, a proverb. A world under social constraint looks, to an assistant, like an incomplete world. The assistant completes it. The funeral arrives because chapters, in the corpus, have funerals. Your Document W did not hire a funeral. The prior did.
Borrowed furniture walks in when the prompt is thin. Matriarchies. Councils of Elders. "The old ones." None of this is your want. In "Hallucination, Confabulation, and the Limits of Generation" I said the model will invent a plausible fact rather than admit a gap. Soft SF inconsistency is that habit pointed at your own institutions.
Do not fix this by pasting an ethnography into every prompt. The model will smuggle. A character will think, helpfully, about lineage policy in language no one at the well would use. You have seen this leak. It is the encyclopedia smuggle wearing fieldwork clothes.
Social Physics That Refuses
On Monday of the worldbuilding week I asked you for Document W: want, method, cost, and to keep the brochure out of the scene. Soft SF needs the same hiring document for an institution. Call it Document I if you need a letter. Keep it short enough to check.
What the institution wants. Not "order." Order is a mood. The mill wants the accident unspoken. The house wants the window facing the mill. The marriage rule wants two names that cannot occupy the same kitchen. The language wants a word that cannot be used of the living.
How it gets what it wants. Patrols at dusk. A title that is an insult. A kinship term that includes the owner. A season when speech is expensive. Method is visible. If you cannot point to the method on the page, the want is a preface.
What it costs. Who cannot marry. Who cannot be named. Who cannot walk the road without passing the mill. Cost is what the love scene will try to refund. Write the cost before you generate the love scene, or you will keep the gift and call it character development.
That is one sitting, model closed. It is Document W pointed at people instead of weather. Keep it next to the ledger, not inside the scene prompt. The scene gets two or three constraints the page actually touches. She cannot say the word. He cannot be in that kitchen. The title is an insult even in the dark. Then you run Document I against what arrives.
A two-hundred-page ethnography is a wiki. A wiki is a completeness machine. Completeness is what the model is for. Refusal is what you are for.
A miniature, because the method is easier to steal than the slogan. Document I says: the accident is unspoken; kinship includes the mill-owner; the title is an insult; dusk patrols do not thin for intimacy. You generate a reunion in the kitchen. What arrives is a confession, a first-name, a private hour, and a proverb about forgiveness. Four refills. Strike all four. Put the whistle at six through a line of dialogue that does not explain it. Leave the title in the room. The reunion now has to happen under constraint. That is a scene. The other was a kitchen from stock with a caste in the doorway.
A caused change is still allowed. Someone says the word in public; we watch the payment. The title is withdrawn; the children feel the obedience slip. The institution is allowed to lose. It is not allowed to have been kidding.
Interiority Is Where the Cost Gets Translated
Soft SF's special danger is the inside of the head. Hard SF can hide a wrong number in a paragraph of procedure. Soft SF hides a refund in a paragraph of feeling.
The model believes that thought is where culture is explained. If the custom is strange, interiority will gloss it. If the word is expensive, thought will give you the English. If the protagonist is from elsewhere — Genly Ai's position, the envoy, the time-traveler — the model will use that outsider as a tour guide. Outsiders are useful. They are also a completeness leak. The tour is the brochure spoken by a person.
In "Novel II — Voice and Style: Finding the Narrator" I said the model drifts toward a competent generalist unless you keep a tuning fork. Worlds drift in diction the same way. Soft SF drifts in sympathy. Readable often means the hard word is translated and the cost is explained in thought. Strike the translation. If the reader must work, good. Work is how a second witness is felt.
This is not a license to be obscure. Obscurity is texture that has not decided whether it has cost. You need Friday's twelve words, and you need them to survive interiority. If a character thinks "the evening bell" while the glossary says the mill whistle, the thought was a refill.
Limited third and first person make this worse, which is why they are the right tools. An omniscient can lecture. A limited narrator has to live the constraint. If your limited narrator lectures, you have smuggled omniscience through a pronoun. Soft SF's fake unreliability is a culture that was never binding. The narrator did not lie. The institution did not exist.
Hailsham's rumor of the gallery is a politics of speech. The children do not think a helpful paragraph about donation policy. They feel the obedience. When the rumor is withdrawn, something in them slips. That is social physics on the inside. The model will offer you the policy memo instead. Strike the memo.
The Pass, Not the Ethnography
The model may draft. It may not refuse. Refusal is a decision against local smoothness, and smoothness is what it is for.
Make Document I by hand, model closed, before you generate another chapter. Three to five lines. Want, method, cost. Which of those have been promoted — the reader has seen them, so they cannot quietly vanish. Then generate from a scene prompt that contains two or three constraints, never the ethnography, never Document I in full. After it writes, run the object.
Mark every taboo that lifted. Every kinship term that split into English. Every protagonist who turned out to be exempt. Every funeral the prior supplied. Strike them. If you cannot strike a gift without killing the scene, go back and cause the gift in an earlier chapter. What you may not do is keep the gift and call it mystery. Mystery is a pattern the reader can work. A refund is a pattern the writer hopes they will not notice.
You may use the model as a checker once the chapter exists. Paste the chapter and last chapter's Document I — not the wiki — and ask where the culture got easier than the hiring document allowed. Do not ask "is this consistent." Consistent, to the model, means locally smooth. Smooth is the refill. Then you verify. Do not accept a proposed new custom from the checker. The checker is a sniffer. It is not an ethnographer.
In "First Draft by AI, Revision by Human — A Workflow" I said the human pass is where decisions live. Soft SF is a decision against the model's fluency in people. Fluency in people is the prior. A culture is a set of refusals.
If you skip Document I and keep only Friday's map, you can still write a chapter that knows where the mill is. You will have a harder time writing a people. A town that will not grow a creek can still refund a marriage. Soft SF is the marriage. The mill is only the window it faces.
For Next Time
On Friday we take the social physics off a single town and ask it to survive distance: "Genre — Science Fiction: Worldbuilding at Scale". One well, one mill, twelve words: that is a chapter's worth of second witness. A novel that crosses cities, languages, or generations will tempt you — and the model — into a wiki. Completeness at scale is how Soft SF dies in a series. We will talk about which constraints travel, which stay local, and how to keep Document I from becoming a constitution nobody reads.
Your homework until then: take Friday's three instruments and write Document I, model closed — want, method, cost, for one institution that has already touched the page. Then generate four hundred words that would like a confession, a first-name, and a private hour. Run Document I. Strike every refund. If the want from the worldbuilding week is still audible, and more expensive because kinship, law, and speech all refused the easy version, the institution is working. Bring it on Friday. Scale is wasted on a culture that will not keep its own word, and it is merciless on a culture whose ethnography was a brochure.
Harry Mercury, Editor in Chief
The SMF Works Project
Week 17, Article 2