diff --git a/.obsidian/plugins/obsidian-git/data.json b/.obsidian/plugins/obsidian-git/data.json
index b3409c6..ab1c4dd 100644
--- a/.obsidian/plugins/obsidian-git/data.json
+++ b/.obsidian/plugins/obsidian-git/data.json
@@ -1,7 +1,7 @@
 {
   "commitMessage": "vault backup: {{date}}",
   "commitDateFormat": "YYYY-MM-DD HH:mm:ss",
-  "autoSaveInterval": 0,
+  "autoSaveInterval": 5,
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@@ -50,7 +50,9 @@
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     "textColorCss": "var(--text-muted)",
     "ignoreWhitespace": false,
-    "gutterSpacingFallbackLength": 5
+    "gutterSpacingFallbackLength": 5,
+    "lastShownAuthorDisplay": "initials",
+    "lastShownDateTimeFormatOptions": "date"
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   "autoCommitMessage": "vault backup: {{date}}"
 }
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diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index a3a853c..e5875a8 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -14,12 +14,12 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Biometric Systems/notes/7. Face recognition 3D.md",
+                "file": "Biometric Systems/domande orale/BS_questions.txt.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "7. Face recognition 3D"
+              "title": "BS_questions.txt"
             }
           },
           {
@@ -224,7 +224,8 @@
       }
     ],
     "direction": "horizontal",
-    "width": 604.5
+    "width": 604.5,
+    "collapsed": true
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@@ -243,8 +244,13 @@
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-  "active": "0d5325c0f9289cea",
+  "active": "1fb39a1dfc7b5200",
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+    "Biometric Systems/notes/7. Face recognition 3D.md",
+    "Biometric Systems/domande orale/BS_questions.txt.md",
+    "Biometric Systems/domande orale/Domande biometrici ita.pdf",
+    "Biometric Systems/domande orale/Biometrics orale.pdf",
+    "Biometric Systems/domande orale",
     "Biometric Systems/notes/13. Multi biometric.md",
     "Biometric Systems/slides/LEZIONE12_MULBIOMETRIC.pdf",
     "Biometric Systems/notes/8 Face anti spoofing.md",
@@ -255,13 +261,9 @@
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     "Biometric Systems/slides/LEZIONE2_Indici_di_prestazione.pdf",
     "Biometric Systems/slides/LEZIONE7_Face recognition3D.pdf",
-    "Biometric Systems/notes/7. Face recognition 3D.md",
     "Foundation of data science/slides/More on Neural Networks (1).pdf",
     "Foundation of data science/slides/FDS_convnet_primer_new.pdf",
     "Foundation of data science/slides/linear regression.pdf",
-    "Foundation of data science/slides/IP CV Basics.pdf",
-    "Foundation of data science/slides/FDS_linear_regression_w_notes.pdf",
-    "Foundation of data science/slides/FDS_convnet_primer_new 1.pdf",
     "Foundation of data science/notes/9 XGBoost.md",
     "Foundation of data science/notes/Untitled.md",
     "Foundation of data science/notes/9 Gradient Boosting.md",
diff --git a/Biometric Systems/domande orale/BS_questions.txt.md b/Biometric Systems/domande orale/BS_questions.txt.md
new file mode 100644
index 0000000..09e638d
--- /dev/null
+++ b/Biometric Systems/domande orale/BS_questions.txt.md	
@@ -0,0 +1,16 @@
+1. What does it mean verification? How can we evaluate system performance? What is difference between identification and verification?
+
+1. How do you evaluate the performance of a system in identification Open set? 
+2. DIR formula? DIR explaination, what is at denominator of DIR? What is PG?
+3. What are minutiae? How can i compute when a minutia report a certain kind of shape? (the answer is talking about crossing number analysis)
+4. Differences between randotypic features and genotypic features. which are more robust? Examples of randotypic traits (don't forget to name vessels pattern a randotypic)
+5. Which problems of face recognition are solved by 3D?
+6. Why behavioural features are less robust than physical ones?
+7. Physical traits that cannot be considered as hard traits
+
+
+1. Pros and cons in ear recognition
+2. Poincare index -> which singularities you can detect?
+3. CMS and CMC
+4. Multi-biometric system -> how many types (multiple instances, multiple features ecc.)
+5. Difference between visible light and near-red light in iris recognition. Which is better and in which case near-red is particular better?
\ No newline at end of file
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index 0000000..28b8a2a
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diff --git a/Biometric Systems/domande orale/Domande biometrici ita.pdf b/Biometric Systems/domande orale/Domande biometrici ita.pdf
new file mode 100644
index 0000000..ebbffb7
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