diff --git a/.gitignore b/.gitignore
index 2552ed7..f0dbcf3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 # Adrian
 .vscode/
 .idea/
-.target/
\ No newline at end of file
+.target/
diff --git a/docs/Use_Case/Organization.png b/docs/Use_Case/Organization.png
new file mode 100644
index 0000000..d7a561f
Binary files /dev/null and b/docs/Use_Case/Organization.png differ
diff --git a/docs/Use_Case/user_case_user.png b/docs/Use_Case/user_case_user.png
new file mode 100644
index 0000000..704f146
Binary files /dev/null and b/docs/Use_Case/user_case_user.png differ
diff --git a/helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/CharityRegistry.java b/helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/CharityRegistry.java
index e69de29..a8d698e 100644
--- a/helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/CharityRegistry.java
+++ b/helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/CharityRegistry.java
@@ -0,0 +1,38 @@
+package ntnu.sytemutvikling.team6.models;
+
+import java.util.*;
+
+public class CharityRegistry{
+    private final List<Charity> charities;
+
+    public CharityRegistry(){
+        this.charities = new ArrayList<>();
+    }
+
+    public List<Charity> getAllCharities(){
+        return Collections.unmodifiableList(charities);
+    }
+
+    public Optional<Charity> findCharityById(UUID charityId){
+        if(charityId == null){
+            throw new IllegalArgumentException("CharityId can not be null.");
+        }
+        return charities.stream()
+        .filter(charity -> charityId.equals(charity.getId()))
+        .findFirst();
+    }
+
+    public void addCharity(Charity charity){
+    if(charity == null){
+        throw new IllegalArgumentException("Charity can not be null.");
+    }
+    charities.add(charity);
+    }
+
+    public boolean removeCharity(UUID charityId){
+        if(charityId == null){
+            throw new IllegalArgumentException("CharityId can not be null.");
+        }
+        return charities.removeIf(charity -> charityId.equals(charity.getId()));
+    }
+}
\ No newline at end of file
diff --git a/helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/DonationRegistry.java b/helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/DonationRegistry.java
index f565298..15787f5 100644
--- a/helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/DonationRegistry.java
+++ b/helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/DonationRegistry.java
@@ -1,5 +1,39 @@
 package ntnu.sytemutvikling.team6.models;
 
+import java.util.*;
+
 public class DonationRegistry {
+    private final List<Donation> donations;
+
+    public DonationRegistry(){
+        this.donations = new ArrayList<>();
+    }
+
+    public List<Donation> getAllDonations(){
+        return Collections.unmodifiableList(donations);
+    }
+
+    public Optional<Donation> findDonationById(UUID donationId){
+        if(donationId == null){
+            throw new IllegalArgumentException("DonationId can not be null.");
+        }
+        return donations.stream()
+        .filter(donations -> donationId.equals(donations.getId()))
+        .findFirst();
+    }
+
+    public void addDonation(Donation donation){
+        if(donation == null){
+            throw new IllegalArgumentException("Donation can not be null.");
+        }
+        donations.add(donation);
+    }
+
+    public boolean removeDonation(UUID donationId){
+        if(donationId == null){
+            throw new IllegalArgumentException("DonationId can not be null.");
+        }
+        return donations.removeIf(donation -> donationId.equals(donation.getId));
+    }
     
 }