diff --git a/4a1s/RAS/PL - Aula 3.md b/4a1s/RAS/PL - Aula 3.md
index 1fa1a6d..9d7fa8d 100644
--- a/4a1s/RAS/PL - Aula 3.md	
+++ b/4a1s/RAS/PL - Aula 3.md	
@@ -44,9 +44,13 @@ dg-publish: true
 >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.
+>5. The maximum delay between the submission of a questionnaire and its confirmation must be half an hour.
+>6. The operator shall be able to communicate by mobile phone with the bus driver.
 >
->>[!hint] Resolution
+>>[!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.
\ No newline at end of file
+>>2. Users of the type students with 20h of training shall correctly use 80% of the system features.
+>>3. *precise and verifiable, but the using 'average' is not a good measurement* -> The maximum delay for the users of a system to pay tolls shall be less than 15s.
+>>4. *depends on the context*
+>>5. *precise and verifiable*
+