diff --git a/anno3/vpc/consegne/2/2.pn.org b/anno3/vpc/consegne/2/2.pn.org
index c85a445..f70bc0a 100644
--- a/anno3/vpc/consegne/2/2.pn.org
+++ b/anno3/vpc/consegne/2/2.pn.org
@@ -48,7 +48,24 @@ stesso padre nei seguenti modi:
 - usando reti WN
 
 
-** TODO Riduzione
+** Riduzione
+Una rete di petri puo` essere ridotta usando le seguendi tecniche:
+- fusione
+- eliminazione
+- rimozione dei loop
+Nelle figure vengono mostrate alcune fasi di riduzione della rete in
+analisi; in ordine sono stati applicati:
+- fusione di alcuni posti
+- fusione di alcune transizioni
+- eliminazione di alcuni posti
+- eliminazione di alcune transizioni
+- riduzione di self loop
+
+[[./riduzioni/fusione1.jpg]]
+[[./riduzioni/fusione2.jpg]]
+[[./riduzioni/eliminazione1.jpg]]
+[[./riduzioni/eliminazione2.jpg]]
+[[./riduzioni/rimozione1.jpg]]
 ** TODO P e T invarianti
 Tramite GreatSPN possiamo calcolare gli T- e P- semiflussi
 
@@ -194,4 +211,27 @@ associati ciascuno ad un master diverso.
 [[./reteD.jpg]]
 
 ** TODO P e T invarianti
-** TODO Decision Diagram
+** Decision Diagram
+L'efficacia dei decision diagram sulla generazione dello stato degli
+spazi dipende fortemente dall'ordine delle variabili.
+Di seguito vengono mostrati i decision diagram usando per le
+assegnazioni i seguenti algoritmi:
+- Sloan: un algoritmo di riduzione della banda di matrici sparse con
+  una buona performance
+- (advanced) Cuthill-McKee: un altro algoritmo di riduzione della banda di
+  matrici sparse
+-  Tovchigrechko e Noack: due algoritmo appositamente ideati per le reti
+  di Petri, anch'essi con una buona performance
+- P-chaining: un algoritmo che sfrutta le informazioni strutturali
+  della rete ma ha una bassa performance
+- Gradient-P
+- Gibbs-Poole-Stockmeier: un altro algoritmo matriciale che nella rete
+  in analisi ha restituito il risultato peggiore
+ 
+[[./diagrammi/sloan.jpg]]
+[[./diagrammi/mckee.jpg]]
+[[./diagrammi/tovchi.jpg]]
+[[./diagrammi/noack.jpg]]
+[[./diagrammi/p-chain.jpg]]
+[[./diagrammi/gradient.jpg]]
+[[./diagrammi/gibbs.jpg]]
diff --git a/anno3/vpc/consegne/2/diagrammi/gibbs.jpg b/anno3/vpc/consegne/2/diagrammi/gibbs.jpg
new file mode 100644
index 0000000..89e38ee
Binary files /dev/null and b/anno3/vpc/consegne/2/diagrammi/gibbs.jpg differ
diff --git a/anno3/vpc/consegne/2/diagrammi/gradient.jpg b/anno3/vpc/consegne/2/diagrammi/gradient.jpg
new file mode 100644
index 0000000..0038169
Binary files /dev/null and b/anno3/vpc/consegne/2/diagrammi/gradient.jpg differ
diff --git a/anno3/vpc/consegne/2/diagrammi/mckee.jpg b/anno3/vpc/consegne/2/diagrammi/mckee.jpg
new file mode 100644
index 0000000..d9f990c
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diff --git a/anno3/vpc/consegne/2/diagrammi/noack.jpg b/anno3/vpc/consegne/2/diagrammi/noack.jpg
new file mode 100644
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diff --git a/anno3/vpc/consegne/2/diagrammi/p-chain.jpg b/anno3/vpc/consegne/2/diagrammi/p-chain.jpg
new file mode 100644
index 0000000..bc5de40
Binary files /dev/null and b/anno3/vpc/consegne/2/diagrammi/p-chain.jpg differ
diff --git a/anno3/vpc/consegne/2/diagrammi/sloan.jpg b/anno3/vpc/consegne/2/diagrammi/sloan.jpg
new file mode 100644
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diff --git a/anno3/vpc/consegne/2/diagrammi/tovchi.jpg b/anno3/vpc/consegne/2/diagrammi/tovchi.jpg
new file mode 100644
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diff --git a/anno3/vpc/consegne/2/riduzione/eliminazione1.jpg b/anno3/vpc/consegne/2/riduzione/eliminazione1.jpg
new file mode 100644
index 0000000..166a2c0
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diff --git a/anno3/vpc/consegne/2/riduzione/fusione1.jpg b/anno3/vpc/consegne/2/riduzione/fusione1.jpg
new file mode 100644
index 0000000..cbf8680
Binary files /dev/null and b/anno3/vpc/consegne/2/riduzione/fusione1.jpg differ
diff --git a/anno3/vpc/consegne/2/riduzione/fusione2.jpg b/anno3/vpc/consegne/2/riduzione/fusione2.jpg
new file mode 100644
index 0000000..d22b767
Binary files /dev/null and b/anno3/vpc/consegne/2/riduzione/fusione2.jpg differ
diff --git a/anno3/vpc/consegne/2/riduzione/rimozione1.jpg b/anno3/vpc/consegne/2/riduzione/rimozione1.jpg
new file mode 100644
index 0000000..fb37120
Binary files /dev/null and b/anno3/vpc/consegne/2/riduzione/rimozione1.jpg differ
diff --git a/anno3/vpc/gspn/EsD-Measures.solution/PT-DD-0.dot b/anno3/vpc/gspn/EsD-Measures.solution/PT-DD-0.dot
index 2769fec..998c811 100644
--- a/anno3/vpc/gspn/EsD-Measures.solution/PT-DD-0.dot
+++ b/anno3/vpc/gspn/EsD-Measures.solution/PT-DD-0.dot
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+  P22 [label="Risultato_2"];
 }
-{rank=same  n89 P22} -> {rank=same  n85 n88 P21} -> {rank=same  n84 n77 n87 P20} -> {rank=same  n83 n76 n86 P19} -> {rank=same  n82 n75 P18} -> {rank=same  n81 n70 P17} -> {rank=same  n80 n66 n69 P16} -> {rank=same  n79 n68 n65 P15} -> {rank=same  n78 n64 P14} -> {rank=same  n59 n63 P13} -> {rank=same  n58 P12} -> {rank=same  n52 n57 P11} -> {rank=same  n51 n42 n56 P10} -> {rank=same  n50 n41 n55 P9} -> {rank=same  n49 n40 n39 n54 P8} -> {rank=same  n48 n38 n53 P7} -> {rank=same  n47 n37 P6} -> {rank=same  n46 n30 P5} -> {rank=same  n45 n29 P4} -> {rank=same  n44 n25 n28 P3} -> {rank=same  n43 n24 P2} -> {rank=same  n1 n23 P1} [style=invis]
+{rank=same  n165 P22} -> {rank=same  n164 n154 P21} -> {rank=same  n163 n153 P20} -> {rank=same  n162 n155 n152 P19} -> {rank=same  n157 n120 n148 P18} -> {rank=same  n156 n117 n119 P17} -> {rank=same  n26 n118 P16} -> {rank=same  n49 n122 n115 n116 P15} -> {rank=same  n149 n151 n110 n112 P14} -> {rank=same  n145 n147 n150 n106 n108 n111 P13} -> {rank=same  n134 n144 n146 n93 n105 n107 P12} -> {rank=same  n132 n133 n143 n91 n92 n104 P11} -> {rank=same  n131 n142 n90 n103 P10} -> {rank=same  n130 n59 n141 n44 n89 n102 P9} -> {rank=same  n129 n58 n137 n140 n38 n43 n88 n97 n101 P8} -> {rank=same  n128 n57 n136 n139 n37 n42 n87 n96 n100 P7} -> {rank=same  n126 n127 n6 n56 n135 n138 n36 n41 n84 n86 n95 n99 P6} -> {rank=same  n5 n55 n35 n40 n83 n85 n94 n98 P5} -> {rank=same  n4 n54 n34 n39 P4} -> {rank=same  n3 n53 n33 P3} -> {rank=same  n2 n31 n32 P2} -> {rank=same  n1 n30 P1} [style=invis]
 }
diff --git a/anno3/vpc/gspn/EsD-Measures.solution/PT-DD-0.pdf b/anno3/vpc/gspn/EsD-Measures.solution/PT-DD-0.pdf
index 9bce6c5..8983379 100644
Binary files a/anno3/vpc/gspn/EsD-Measures.solution/PT-DD-0.pdf and b/anno3/vpc/gspn/EsD-Measures.solution/PT-DD-0.pdf differ
diff --git a/todo.org b/todo.org
index 3d50773..123db09 100644
--- a/todo.org
+++ b/todo.org
@@ -9,6 +9,8 @@
 - [ ] analisi
 - [ ] uppal
 - [ ] controlla esercizi nuovi
+- [ ] Chiedi perche` non riesci a riprodurre  ivariable ordering
+  mostrati da euristica
 - [ ] Controlla bene e studia Symbolic Reachability Graph: perche`
   cosi` buono?