diff --git a/README.md b/README.md
index 960e263..c23dd6c 100644
--- a/README.md
+++ b/README.md
@@ -324,6 +324,17 @@ sentences and would pull every page down to "very easy". The
 `rate.json` in `runs/contractor-build-2026-09-21/` predates this and
 its `asked` and `next` columns are the old, pinned ones.
 
+`rate --repo` also scores the **desks**, the inside of the business,
+which reads button labels and nothing else: for every desk and bucket
+with two or more buttons, a worker is told what has just happened to
+a case (in the state's own words, never the label's) and picks the
+button among that desk's, in a rotated order. Scored per desk as
+right of total, with what each miss was mistaken for. Measured on
+2026-09-24: the vel's neighbour-help desk 2 of 4 ("not solved" taken
+for "connect a neighbour"), the notice board 1 of 2, the planned
+contractor's subcontractor desk 4 of 7 (checking, approved and
+rejected all crossed). A desk that scores full marks has labels a
+stranger to the business could press right.
 ## Measured so far
 
 **Generated: a building contractor** (`runs/contractor-2026-09-21/`),
diff --git a/src/rate.rs b/src/rate.rs
index 17beda5..65670c5 100644
--- a/src/rate.rs
+++ b/src/rate.rs
@@ -156,8 +156,57 @@ fn followup_page(repo: Option<&Path>, step: &Value) -> Option<Value> {
     load_page(repo, action)
 }
 
-/// `/` is `questions/index.yaml`; `/a/b` is `questions/a/b.yaml` or
-/// `questions/a/b/index.yaml`.
+/// Every desk's buttons per bucket, from the simulation model:
+/// (page, group, bucket, [(from, to, label)]). A desk with one button
+/// for a bucket has nothing to confuse and is left out.
+fn desk_buttons(model: &Value) -> Vec<(String, String, String, Vec<(String, String, String)>)> {
+    let mut out = Vec::new();
+    for (bucket, spec) in model["buckets"].as_object().into_iter().flatten() {
+        for desk in spec["desks"].as_array().into_iter().flatten() {
+            let moves: Vec<(String, String, String)> = desk["moves"]
+                .as_array()
+                .into_iter()
+                .flatten()
+                .map(|m| (s(&m["from"]), s(&m["to"]), s(&m["label"])))
+                .filter(|(_, _, l)| !l.is_empty())
+                .collect();
+            if moves.len() >= 2 {
+                out.push((s(&desk["page"]), s(&desk["group"]), bucket.clone(), moves));
+            }
+        }
+    }
+    out.sort();
+    out
+}
+
+fn s(v: &Value) -> String {
+    v.as_str().unwrap_or_default().to_string()
+}
+
+/// A worker on the desk, told what just happened to a case, picks
+/// the button for it. The outcome is put in plain words from the
+/// state's own name, never from the label, and the buttons are listed
+/// in a seeded shuffle.
+fn button_pick(cmd: &str, group: &str, bucket: &str, from: &str, to: &str, labels: &[&str], seed: usize) -> anyhow::Result<String> {
+    let plain = |id: &str| id.replace(['_', '-'], " ");
+    let mut order: Vec<&str> = labels.to_vec();
+    // A fixed rotation per move: the right answer is not always first.
+    let by = seed % order.len().max(1);
+    order.rotate_left(by);
+    let listed: Vec<String> = order.iter().enumerate().map(|(i, l)| format!("{}. {l}", i + 1)).collect();
+    let prompt = format!(
+        "You work on the {} desk of a small organisation. A case in \"{}\" was \"{}\" and has just become \"{}\". The desk shows these buttons for it:\n\n{}\n\nWhich button records what just happened? Reply as JSON: {{\"choice\": <the button's number>}}",
+        plain(group),
+        plain(bucket),
+        plain(from),
+        plain(to),
+        listed.join("\n")
+    );
+    let reply = ask(cmd, &prompt, &seed.to_string())?;
+    let n = reply["choice"].as_u64().unwrap_or(0) as usize;
+    Ok(order.get(n.wrapping_sub(1)).map(|l| l.to_string()).unwrap_or_default())
+}
+
 /// Every `mail:` on a state in the repo's aggregates.yaml, as
 /// (`bucket:state`, subject, body) with the `{placeholders}` taken
 /// out, so they read as the person will read them.
@@ -193,6 +242,8 @@ pub(crate) fn mail_texts(repo: &Path) -> Option<Vec<(String, String, String)>> {
     Some(out)
 }
 
+/// `/` is `questions/index.yaml`; `/a/b` is `questions/a/b.yaml` or
+/// `questions/a/b/index.yaml`.
 pub(crate) fn load_page(repo: &Path, route: &str) -> Option<Value> {
     let rel = route.trim_matches('/');
     let candidates = if rel.is_empty() {
@@ -248,6 +299,30 @@ pub fn rate(argv: &[String]) -> anyhow::Result<()> {
     }
 
     let mut report = BTreeMap::new();
+    // The desks: the inside of the business reads button labels and
+    // nothing else, so each desk is scored on whether a worker told
+    // what has just happened to a case picks the right button among
+    // that desk's buttons for the bucket.
+    let desks = desk_buttons(&model);
+    if !desks.is_empty() {
+        println!("{:<20} {:<24} {:>8}   {}", "desk", "bucket", "buttons", "mistaken for");
+        for (page, group, bucket, moves) in &desks {
+            let labels: Vec<&str> = moves.iter().map(|(_, _, l)| l.as_str()).collect();
+            let mut right = 0;
+            let mut mistaken = Vec::new();
+            for (i, (from, to, label)) in moves.iter().enumerate() {
+                let picked = button_pick(&cmd, group, bucket, from, to, &labels, i)?;
+                if picked == *label {
+                    right += 1;
+                } else {
+                    mistaken.push(format!("{to} as {picked:?}"));
+                }
+            }
+            println!("{:<20} {:<24} {:>3} of {:<2}   {}", page, bucket, right, moves.len(), mistaken.join("; "));
+            report.insert(format!("desk {page} {bucket}"), json!({ "right": right, "of": moves.len(), "mistaken": mistaken }));
+        }
+        println!();
+    }
     // The mails first, when the repo carries any: a person reads a
     // mail alone, with no card around it, so its prose is rated on
     // its own - LIX and length.