diff --git a/public/simulate.html b/public/simulate.html
index 1da0b01..a52ac31 100644
--- a/public/simulate.html
+++ b/public/simulate.html
@@ -219,6 +219,11 @@
                 <h4>B2B License Provisioning</h4>
                 <p>Invite token → org + user + API key creati atomicamente. SSO JWT.</p>
             </div>
+            <div class="sim-card" onclick="selectSim(this, 'big')" style="border-color:#7c3aed;">
+                <div class="sim-badge" style="background:rgba(124,58,237,.2);color:#c4b5fd;border:1px solid rgba(124,58,237,.4);">BIG</div>
+                <h4>Big Simulation — 10 Aziende</h4>
+                <p>Copertura totale: 18 fasi, 800 risposte assessment, 55+ rischi, incidenti Art.23, NCR/CAPA, whistleblowing, audit chain, Services API.</p>
+            </div>
         </div>
 
         <!-- Controlli -->
@@ -297,6 +302,7 @@ const SIM_LABELS = {
     sim04: 'SIM-04 Whistleblowing',
     sim05: 'SIM-05 Audit Chain',
     sim06: 'SIM-06 B2B License',
+    big:   'BIG — 10 Aziende (18 fasi)',
 };
 
 // ── Selezione scenario ────────────────────────────────────────────────────
@@ -447,20 +453,24 @@ function runSimulation() {
         sim04: 'SIM-04 — Whistleblowing SCADA',
         sim05: 'SIM-05 — Audit Trail Hash Chain',
         sim06: 'SIM-06 — B2B License Provisioning',
+        big:   'BIG — 10 Aziende, 18 Fasi, Copertura Totale',
     };
     const scenarioName = labels[selectedSim] || selectedSim;
-    const resetNote = selectedSim !== 'sim06'
+    const resetNote = (selectedSim !== 'sim06' && selectedSim !== 'big')
         ? '\n↺ I dati demo precedenti verranno ripuliti automaticamente.'
-        : '\n(SIM-06 è indipendente — nessun reset automatico)';
+        : selectedSim === 'big'
+            ? '\n↺ Auto-reset dei dati demo incluso nella FASE 0.'
+            : '\n(SIM-06 è indipendente — nessun reset automatico)';
+    const bigNote = selectedSim === 'big'
+        ? '\n\n10 aziende: InfraTech, MedSalute, DistribuzionePlus, BancaRegionale,\nAquaPura, LogisticaRapida, SmartCity, EduDigital, AgriTech, ManufacturingPro\n\n⚠ Target: ✓200+ — Durata stimata: ~15-20 minuti'
+        : '';
 
     if (!confirm(
         'Avvia Simulazione NIS2 Agile?\n\n' +
-        '▸ ' + scenarioName + '\n\n' +
-        '• DataCore S.r.l. (IT/Cloud - Essential)\n' +
-        '• MedClinic Italia S.p.A. (Sanità - Important)\n' +
-        '• EnerNet Distribuzione S.r.l. (Energia - Critical)\n' +
-        resetNote + '\n' +
-        '\nDurata stimata: ~8-12 minuti'
+        '▸ ' + scenarioName +
+        (selectedSim !== 'big' ? '\n\n• DataCore S.r.l. (IT/Cloud - Essential)\n• MedClinic Italia S.p.A. (Sanità - Important)\n• EnerNet Distribuzione S.r.l. (Energia - Critical)' : '') +
+        bigNote + resetNote + '\n' +
+        (selectedSim !== 'big' ? '\nDurata stimata: ~8-12 minuti' : '')
     )) return;
 
     if (evtSource) { evtSource.close(); evtSource = null; }
@@ -473,7 +483,9 @@ function runSimulation() {
     document.getElementById('statsGrid').style.display = 'none';
     document.getElementById('consoleTitle').textContent = 'NIS2 Agile Simulator v2.0 — ' + (SIM_LABELS[selectedSim] || selectedSim);
 
-    const url = `simulate-nis2.php?sim=${selectedSim}&t=${Date.now()}`;
+    const url = selectedSim === 'big'
+        ? `simulate-nis2-big.php?t=${Date.now()}`
+        : `simulate-nis2.php?sim=${selectedSim}&t=${Date.now()}`;
     evtSource  = new EventSource(url);
 
     let phaseCount = 0;
diff --git a/simulate-nis2-big.php b/simulate-nis2-big.php
index 57b6575..86125bf 100644
--- a/simulate-nis2-big.php
+++ b/simulate-nis2-big.php
@@ -1307,7 +1307,7 @@ foreach ($COMPANIES as $slug => $comp) {
                 if ($uid) {
                     $assignRes = api('POST', '/training/assign', [
                         'course_id' => $courseId,
-                        'user_id'   => $uid,
+                        'user_ids'  => [$uid],
                         'due_date'  => date('Y-m-d', strtotime('+30 days')),
                     ], $jwt, $orgId);
                     if (!empty($assignRes['success'])) {