diff --git a/app/src/main/java/Programs/Factorial.java b/app/src/main/java/Programs/Factorial.java
index bc5fb38..e69de29 100644
--- a/app/src/main/java/Programs/Factorial.java
+++ b/app/src/main/java/Programs/Factorial.java
@@ -1,20 +0,0 @@
-package Programs;
-
-import hatelace.*;
-import hatelace.instructions.*;
-
-public class Factorial extends Program {
-    public Factorial() {
-        Address n = new Address(0),
-                fac = new Address(1);
-
-        add(new Copy(new IntWord(5), n));
-        add(new Copy(new IntWord(1), fac));
-        add(new JumpEq(6, n, new IntWord(1)));
-        add(new Mul(fac, n, fac));
-        add(new Add(n, new IntWord(-1), n));
-        add(new Jump(2));
-        add(new Print(fac));
-        add(new Halt());
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/hatelace/Computer.java b/app/src/main/java/hatelace/Computer.java
index f8dcf99..50d762c 100644
--- a/app/src/main/java/hatelace/Computer.java
+++ b/app/src/main/java/hatelace/Computer.java
@@ -15,7 +15,7 @@ public class Computer {
     public void run() {
         // Note that the instructions themselves are responsible for incrementing the PC
         for(ProgramCounter PC = new ProgramCounter(); PC.getPC() < this.program.size() && !PC.halted() && PC.getSysTicks() < 100; ) {
-            program.get(PC.getPC()).execute(this.memory, PC);
+            program.getInstructions()[PC.getPC()].execute(this.memory, PC);
         }
     }
 }
diff --git a/app/src/main/java/hatelace/Main.java b/app/src/main/java/hatelace/Main.java
index 9dcb7f1..f06c53e 100644
--- a/app/src/main/java/hatelace/Main.java
+++ b/app/src/main/java/hatelace/Main.java
@@ -1,6 +1,6 @@
 package hatelace;
 
-import Programs.Factorial;
+import hatelace.instructions.*;
 
 public class Main {
     public static void main(String[] args) {
@@ -8,15 +8,26 @@ public class Main {
 
         Memory memory = new IntMemory(64); // 64 words of memory
         Computer computer = new Computer(memory);
-        Program program = new Factorial();
 
+        Address n = new Address(0), fac = new Address(1);
+
+        Program program = new Program(new Instruction[] {
+            new Copy(new IntWord(5), n),
+            new Copy(new IntWord(1), fac),
+            new JumpEq(6, n, new IntWord(1)),
+            new Mul(fac, n, fac),
+            new Add(n, new IntWord(-1), n),
+            new Jump(2),
+            new Print(fac),
+            new Halt()
+        });
         computer.load(program);
         computer.run();
         memory.dump();
 
         // Print the program
         System.out.println("Program:");
-        for (Instruction instruction : program) {
+        for (Instruction instruction : program.getInstructions()) {
             System.out.println(instruction);
         }
 
diff --git a/app/src/main/java/hatelace/Program.java b/app/src/main/java/hatelace/Program.java
index 510478f..859b86b 100644
--- a/app/src/main/java/hatelace/Program.java
+++ b/app/src/main/java/hatelace/Program.java
@@ -1,6 +1,17 @@
 package hatelace;
 
-import java.util.ArrayList;
+public class Program {
+    private Instruction[] instructions;
 
-// This is simply an intermediate class to comply with the specified API requirements.
-public abstract class Program extends ArrayList<Instruction> {}
+    public Program(Instruction[] instructions) {
+        this.instructions = instructions;
+    }
+
+    public Instruction[] getInstructions() {
+        return this.instructions;
+    }
+
+    public int size() {
+        return this.instructions.length;
+    }
+}
diff --git a/app/src/main/java/hatelace/instructions/Add.java b/app/src/main/java/hatelace/instructions/Add.java
index 76b3115..a81f1d9 100644
--- a/app/src/main/java/hatelace/instructions/Add.java
+++ b/app/src/main/java/hatelace/instructions/Add.java
@@ -3,19 +3,18 @@ package hatelace.instructions;
 import hatelace.*;
 
 public class Add extends Instruction {
-    private Address src;
-    private Word imm;
+    private Address op1;
+    private Word op2;
     private Address dest;
 
-    /** Add immediate value to memory address. */
-    public Add(Address src, Word imm, Address dest) {
-        this.src = src;
-        this.imm = imm;
+    public Add(Address op1, Word op2, Address dest) {
+        this.op1 = op1;
+        this.op2 = op2;
         this.dest = dest;
     }
 
     public void execute(Memory memory, ProgramCounter PC) {
-        memory.write(this.dest, memory.read(this.src).add(this.imm));
+        memory.write(this.dest, memory.read(this.op1).add(this.op2));
         PC.incPC();
     }
 
@@ -24,6 +23,6 @@ public class Add extends Instruction {
     }
 
     protected Object[] operands() {
-        return new Object[] { this.src, this.imm, this.dest };
+        return new Object[] { this.op1, this.op2, this.dest };
     }
 }
diff --git a/app/src/main/java/hatelace/instructions/Copy.java b/app/src/main/java/hatelace/instructions/Copy.java
index 9521879..d9c602f 100644
--- a/app/src/main/java/hatelace/instructions/Copy.java
+++ b/app/src/main/java/hatelace/instructions/Copy.java
@@ -3,17 +3,16 @@ package hatelace.instructions;
 import hatelace.*;
 
 public class Copy extends Instruction {
-    private Word imm;
-    private Address dest;
+    private Word word;
+    private Address address;
 
-    /** Copy immediate value to memory address. */
-    public Copy(Word imm, Address dest) {
-        this.imm = imm;
-        this.dest = dest;
+    public Copy(Word word, Address address) {
+        this.word = word;
+        this.address = address;
     }
 
     public void execute(Memory memory, ProgramCounter PC) {
-        memory.write(this.dest, this.imm);
+        memory.write(this.address, this.word);
         PC.incPC();
     }
 
@@ -22,6 +21,6 @@ public class Copy extends Instruction {
     }
 
     protected Object[] operands() {
-        return new Object[] {this.imm, this.dest};
+        return new Object[] {this.word, this.address};
     }
 }
diff --git a/app/src/main/java/hatelace/instructions/Halt.java b/app/src/main/java/hatelace/instructions/Halt.java
index 569f868..20804d9 100644
--- a/app/src/main/java/hatelace/instructions/Halt.java
+++ b/app/src/main/java/hatelace/instructions/Halt.java
@@ -3,7 +3,6 @@ package hatelace.instructions;
 import hatelace.*;
 
 public class Halt extends Instruction {
-    /** Halts the CPU */
     public Halt(){};
 
     public void execute(Memory memory, ProgramCounter PC) {
diff --git a/app/src/main/java/hatelace/instructions/Jump.java b/app/src/main/java/hatelace/instructions/Jump.java
index 373dcb0..4cd3b92 100644
--- a/app/src/main/java/hatelace/instructions/Jump.java
+++ b/app/src/main/java/hatelace/instructions/Jump.java
@@ -5,7 +5,6 @@ import hatelace.*;
 public class Jump extends Instruction {
     private int index;
 
-    /** Unconditional jump, non-relative */
     public Jump(int index) {
         this.index = index;
     }
diff --git a/app/src/main/java/hatelace/instructions/JumpEq.java b/app/src/main/java/hatelace/instructions/JumpEq.java
index ecfc138..2491248 100644
--- a/app/src/main/java/hatelace/instructions/JumpEq.java
+++ b/app/src/main/java/hatelace/instructions/JumpEq.java
@@ -4,18 +4,17 @@ import hatelace.*;
 
 public class JumpEq extends Instruction {
     private int index;
-    private Address src;
-    private Word imm;
+    private Address address;
+    private Word value;
 
-    /** Conditional jump */
-    public JumpEq(int index, Address src, Word imm) {
+    public JumpEq(int index, Address address, Word value) {
         this.index = index;
-        this.src = src;
-        this.imm = imm;
+        this.address = address;
+        this.value = value;
     }
 
     public void execute(Memory memory, ProgramCounter PC) {
-        if (this.imm.equals(memory.read(this.src))) {
+        if (this.value.equals(memory.read(this.address))) {
             PC.setPC(this.index);
         } else {
             PC.incPC();
@@ -27,6 +26,6 @@ public class JumpEq extends Instruction {
     }
 
     protected Object[] operands() {
-        return new Object[] {this.index, this.src, this.imm};
+        return new Object[] {this.index, this.address, this.value};
     }
 }
diff --git a/app/src/main/java/hatelace/instructions/Mul.java b/app/src/main/java/hatelace/instructions/Mul.java
index d70cb0b..c71f703 100644
--- a/app/src/main/java/hatelace/instructions/Mul.java
+++ b/app/src/main/java/hatelace/instructions/Mul.java
@@ -3,19 +3,18 @@ package hatelace.instructions;
 import hatelace.*;
 
 public class Mul extends Instruction {
-    private Address src1;
-    private Address src2;
+    private Address op1;
+    private Address op2;
     private Address dest;
 
-    /** Multiply contents of two addresses and store the result in a third memory address. */
-    public Mul(Address src1, Address src2, Address dest) {
-        this.src1 = src1;
-        this.src2 = src2;
+    public Mul(Address op1, Address op2, Address dest) {
+        this.op1 = op1;
+        this.op2 = op2;
         this.dest = dest;
     }
 
     public void execute(Memory memory, ProgramCounter PC) {
-        memory.write(this.dest, memory.read(this.src1).multiply(memory.read(this.src2)));
+        memory.write(this.dest, memory.read(this.op1).multiply(memory.read(this.op2)));
         PC.incPC();
     }
 
@@ -24,6 +23,6 @@ public class Mul extends Instruction {
     }
 
     protected Object[] operands() {
-        return new Object[] { this.src1, this.src2, this.dest };
+        return new Object[] {this.op1, this.op2, this.dest};
     }
 }
diff --git a/app/src/main/java/hatelace/instructions/Print.java b/app/src/main/java/hatelace/instructions/Print.java
index 88f0f6c..6aa3cec 100644
--- a/app/src/main/java/hatelace/instructions/Print.java
+++ b/app/src/main/java/hatelace/instructions/Print.java
@@ -5,7 +5,6 @@ import hatelace.*;
 public class Print extends Instruction {
     private Address address;
 
-    /** Print content of memory address */
     public Print(Address address) {
         this.address = address;
     }