diff --git a/School/Analyse/Periode 2/Week 1.md b/School/Analyse/Periode 2/Week 1.md
index c68c724..086a8e1 100644
--- a/School/Analyse/Periode 2/Week 1.md	
+++ b/School/Analyse/Periode 2/Week 1.md	
@@ -59,13 +59,24 @@ when program issues IO command, cpu is granted to the next program.
 
 **Parallel**: If the computer has multiple CPU's or Cores, the programs run in parallel. -> **Physically simultaneous**
 
+![[conc-parallel.png]]
+
 # Sharing Resources
-Sometimes diffrent programs (or same program) may share resources.
+Sometimes different 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.
 
+# Concurrency
+Unlike parallelism, concurrency is not always about running faster.
+- Single cpu/core computers may also use concurrency.
+
+Useful for:
+- App responsiveness.
+- Processor utilization (hide IO time)
+- Failure isolation
+
 
 
 
diff --git a/conc-parallel.png b/conc-parallel.png
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