diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 6f4a0ed..96549d2 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "4a1s/ESR/TP1 -  To Do.md",
+                "file": "4a1s/RAS/PL - Aula 3.md",
                 "mode": "source",
                 "source": false
               }
@@ -85,7 +85,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "4a1s/ESR/TP1 -  To Do.md",
+                "file": "4a1s/RAS/PL - Aula 3.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -102,7 +102,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "4a1s/ESR/TP1 -  To Do.md",
+                "file": "4a1s/RAS/PL - Aula 3.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -125,7 +125,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "4a1s/ESR/TP1 -  To Do.md"
+                "file": "4a1s/RAS/PL - Aula 3.md"
               }
             }
           },
@@ -160,14 +160,16 @@
   },
   "active": "98e0287d38212615",
   "lastOpenFiles": [
-    "4a1s/DAA/PL - Aula 2.md",
+    "4a1s/RAS/PL - Aula 2.md",
+    "4a1s/RAS/PL - Aula 1.md",
+    "4a1s/RAS/PL - Aula 3.md",
     "4a1s/ESR/TP1 -  To Do.md",
+    "4a1s/DAA/PL - Aula 2.md",
     "4a1s/ESR",
     "My Digital Garden.md",
     "Private-Project",
     "4a1s/RAS/T - Aula 3.md",
     "Excalidraw/Drawing 2023-09-27 17.15.52.excalidraw.md",
-    "4a1s/RAS/PL - Aula 2.md",
     "4a1s/RAS/T - Aula 1.md",
     "4a1s/Excalidraw/RAS/process.excalidraw.md",
     "4a1s/Excalidraw/RAS",
@@ -179,7 +181,6 @@
     "4a1s/MFES/T - Aula 2.md",
     "4a1s/MFES/PL - Aula 1.md",
     "4a1s/CP/PL - Aula 2.md",
-    "4a1s/RAS/PL - Aula 1.md",
     "4a1s/RAS/T - Aula 2.md",
     "4a1s/RAS/Notas Projeto RAS.md",
     "Excalidraw",
@@ -189,7 +190,6 @@
     "4a1s/index.md",
     "4a1s/Excalidraw/MFES/Ficha1_ex2.excalidraw.md",
     "4a1s/Excalidraw/ASCN/SOA.excalidraw.md",
-    "4a1s/Excalidraw/ASCN/server-group.excalidraw.md",
     "-.32118",
     "4a1s/ASCN/T",
     "4a1s/ASCN/T.32118",
diff --git a/4a1s/RAS/PL - Aula 2.md b/4a1s/RAS/PL - Aula 2.md
index f1bf644..3cc4763 100644
--- a/4a1s/RAS/PL - Aula 2.md	
+++ b/4a1s/RAS/PL - Aula 2.md	
@@ -1,8 +1,7 @@
 ---
 dg-publish: true
 ---
-
-27 de Setembro 2023 - #RAS 
+🌫 27 de Setembro 2023 - #RAS 
 
 >[!help]+ Ex 5.1
 >Imagine that a software engineer, who concluded recently his degree at a given university, is leading a requirements engineering team for a project to improve the software application that permits students to enroll and register in degrees offered by that university. Which of the following requirements elicitation techniques are adequate for capturing the typical and atypical activities involved in the use of the application?
diff --git a/4a1s/RAS/PL - Aula 3.md b/4a1s/RAS/PL - Aula 3.md
new file mode 100644
index 0000000..a7ab0e5
--- /dev/null
+++ b/4a1s/RAS/PL - Aula 3.md	
@@ -0,0 +1,24 @@
+4 de Outubro 2023 - #RAS 
+
+>[!help]+ Ex. 7.1
+>The use of a natural language (for instance, English or Spanish) and intuitive diagrams is used for documenting user requirements. What is the main reason?
+>
+>1. To eliminate the communication difficulties among the stakeholders.
+>2. To facilitate understanding
+>3. To have no ambiguities
+>4. To be precise
+>   
+>>[!hint]- Resolution
+>>Option 2 is the correct one.
+
+
+>[!help]+ Ex. 7.2
+>Which of the following sentences does not constitute a valid system requirement?
+>
+>1. The product shall be developed using an agile method.
+>2. The product shall respond to all requests in less than 5s
+>3. The product shall be composed of 12 modules.
+>4. The product shall use always menu screens to communicate with the users.
+>   
+>>[!hint]- Resolution
+>>Option 2 is the correct one.