diff --git a/School/Analyse/Periode 2/Week 1.md b/School/Analyse/Periode 2/Week 1.md
index 910b2a0..c68c724 100644
--- a/School/Analyse/Periode 2/Week 1.md	
+++ b/School/Analyse/Periode 2/Week 1.md	
@@ -55,7 +55,16 @@ If computer has multiple CPUS, each task can be given a different CPU.
 when program issues IO command, cpu is granted to the next program.
 
 # Concurrent vs Parallel
-Concurrent: Fast switching from a program to the next program (context switch) can create the illusion that they are being executed at the same time. -> Logically Simultaneous
+**Concurrent**: Fast switching from a program to the next program (context switch) can create the illusion that they are being executed at the same time. -> **Logically Simultaneous**
+
+**Parallel**: If the computer has multiple CPU's or Cores, the programs run in parallel. -> **Physically simultaneous**
+
+# Sharing Resources
+Sometimes diffrent programs (or same program) may share resources.
+
+If data is **sequentially** accessible, programs should take turns accessing resource/data.
+
+Fast shared resource access can create **concurrent** access.