diff --git a/4a1s/RAS/PL - Aula 3.md b/4a1s/RAS/PL - Aula 3.md
index d294d22..1fa1a6d 100644
--- a/4a1s/RAS/PL - Aula 3.md	
+++ b/4a1s/RAS/PL - Aula 3.md	
@@ -36,5 +36,17 @@ dg-publish: true
 >4. not verifiable
 >
 >>[!hint]- Resolution
->>Option 
+>>Option 1 is the correct one.
 
+>[!help] Ex. 7.6
+>Analyse the following user requirements and indicate if they are clear and verifiable. If not, reformulate the wording.
+>1. The communication system can only "crash", at most, once a month.
+>2. The system shall be easy to learn by students with minimal training.
+>3. The average delay for the users of a system to pay tolls shall be less than 15s.
+>4. All users shall use the same mobile application.
+>
+>>[!hint] Resolution
+>>1. The communication system shall be available 95% of the time.
+>>2. Users of the type students shall correctly use 80% of the system features with 20h of training on it.
+>>3. More than 90% of the users 
+>>4.
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