diff --git a/src/main/java/com/example/baseball/BaseBallApplication.java b/src/main/java/com/example/baseball/BaseBallApplication.java
new file mode 100644
index 0000000..354cc1f
--- /dev/null
+++ b/src/main/java/com/example/baseball/BaseBallApplication.java
@@ -0,0 +1,10 @@
+package com.example.baseball;
+
+import com.example.baseball.game.BaseBallGame;
+
+public class BaseBallApplication {
+	public static void main(String[] args) {
+		BaseBallGame baseBallGame = new BaseBallGame(null, null);
+		baseBallGame.run(null);
+	}
+}
diff --git a/src/main/java/com/example/baseball/balls/Ball.java b/src/main/java/com/example/baseball/balls/Ball.java
new file mode 100644
index 0000000..7bfedeb
--- /dev/null
+++ b/src/main/java/com/example/baseball/balls/Ball.java
@@ -0,0 +1,17 @@
+package com.example.baseball.balls;
+
+/**
+ * 값 객체의 역할을 하는 클래스
+ */
+public class Ball {
+	private final int value;
+	
+	public Ball(int value) {
+		this.value = value;
+	}
+	
+	public boolean isMatch(Ball user) {
+		// TODO 값이 같은지 비교하는 로직을 구현한다.
+		return false;
+	}
+}
diff --git a/src/main/java/com/example/baseball/balls/Balls.java b/src/main/java/com/example/baseball/balls/Balls.java
new file mode 100644
index 0000000..42e44bc
--- /dev/null
+++ b/src/main/java/com/example/baseball/balls/Balls.java
@@ -0,0 +1,24 @@
+package com.example.baseball.balls;
+
+import java.util.List;
+
+/**
+ * Ball에 대한 로직을 담은 일급 컬렉션 클래스
+ */
+public class Balls {
+	private final List<Ball> balls;
+	
+	public Balls(List<Ball> balls) {
+		this.balls = balls;
+	}
+	
+	public boolean isStrike(Ball user, int idx) {
+		// TODO 스트라이크 여부를 판단하는 로직을 구현한다.
+		return false;
+	}
+	
+	public boolean isBall(Ball user, int idx) {
+		// TODO 볼 여부를 판단하는 로직을 구현한다.
+		return false;
+	}
+}
diff --git a/src/main/java/com/example/baseball/balls/Pitching.java b/src/main/java/com/example/baseball/balls/Pitching.java
new file mode 100644
index 0000000..768e5d3
--- /dev/null
+++ b/src/main/java/com/example/baseball/balls/Pitching.java
@@ -0,0 +1,24 @@
+package com.example.baseball.balls;
+
+/**
+ * 비교 연산 및 결과 값을 담는 클래스
+ */
+public class Pitching {
+	private final int strike;
+	private final int ball;
+	
+	public Pitching(int strike, int ball) {
+		this.strike = strike;
+		this.ball = ball;
+	}
+	
+	public static Pitching matches(Balls computer, Balls user) {
+		// TODO 스트라이크 및 볼을 연산하는 로직을 구현한다.
+		return null;
+	}
+	
+	public boolean isStrike() {
+		// TODO 스트라이크 여부를 판단하는 로직을 구현한다.
+		return false;
+	}
+}
diff --git a/src/main/java/com/example/baseball/game/BaseBallGame.java b/src/main/java/com/example/baseball/game/BaseBallGame.java
new file mode 100644
index 0000000..f1f4f40
--- /dev/null
+++ b/src/main/java/com/example/baseball/game/BaseBallGame.java
@@ -0,0 +1,38 @@
+package com.example.baseball.game;
+
+import com.example.baseball.balls.Balls;
+import com.example.baseball.balls.Pitching;
+import com.example.baseball.io.Input;
+import com.example.baseball.io.Output;
+import com.example.baseball.strategy.NumberGenerator;
+
+public class BaseBallGame {
+	private final Input input;
+	private final Output output;
+	
+	public BaseBallGame(Input input, Output output) {
+		this.input = input;
+		this.output = output;
+	}
+	
+	/**
+	 * 전체 게임의 트랜잭션을 책임지는 클래스
+	 */
+	public void run(NumberGenerator numberGenerator) {
+		// 야구 게임은 게임을 끝낼 때까지 반복이 가능
+		
+		do {
+			// 1. 게임 시작
+			// 2. 컴퓨터(target) 숫자 생성
+			Balls computer = numberGenerator.throwing();
+			// 2.1 컴휴터가 생성한 숫자는 서로 다른 세 개 숫자로 이루어진다.
+			Pitching pitching = new Round(input, output)
+				.start(computer);
+			// 3. 사용자 숫자 입력
+			// 3.1 사용자가 입력한 숫자는 서로 다른 세 개 숫자로 이루어진다.
+			// 4. 사용자 숫자와 컴퓨터 숫자 비교
+			// 5. 사용자 숫자와 컴퓨터 숫자의 위치와 크기가 모두 같으면 게임 종료
+			output.print(pitching.toString());
+		} while(input.isReGame());
+	}
+}
diff --git a/src/main/java/com/example/baseball/game/Round.java b/src/main/java/com/example/baseball/game/Round.java
new file mode 100644
index 0000000..c1a0537
--- /dev/null
+++ b/src/main/java/com/example/baseball/game/Round.java
@@ -0,0 +1,32 @@
+package com.example.baseball.game;
+
+import com.example.baseball.balls.Balls;
+import com.example.baseball.balls.Pitching;
+import com.example.baseball.io.Input;
+import com.example.baseball.io.Output;
+
+public class Round {
+	private final Input input;
+	private final Output output;
+	
+	public Round(Input input, Output output) {
+		this.input = input;
+		this.output = output;
+	}
+	
+	public Pitching start(Balls computer) {
+		
+		Pitching pitching;
+		do {
+			// 3. 사용자 숫자 입력
+			Balls user = input.throwing();
+			// 4. 사용자 숫자와 컴퓨터 숫자 비교
+			pitching = Pitching.matches(computer, user);
+			// 5. 사용자 숫자와 컴퓨터 숫자의 위치와 크기가 모두 같으면 게임 종료
+			output.print(pitching.toString());
+			
+		} while(!pitching.isStrike());
+		
+		return pitching;
+	}
+}
diff --git a/src/main/java/com/example/baseball/io/Input.java b/src/main/java/com/example/baseball/io/Input.java
new file mode 100644
index 0000000..147cce2
--- /dev/null
+++ b/src/main/java/com/example/baseball/io/Input.java
@@ -0,0 +1,9 @@
+package com.example.baseball.io;
+
+import com.example.baseball.balls.Balls;
+
+public interface Input {
+	boolean isReGame();
+	
+	Balls throwing();
+}
diff --git a/src/main/java/com/example/baseball/io/Output.java b/src/main/java/com/example/baseball/io/Output.java
new file mode 100644
index 0000000..694698c
--- /dev/null
+++ b/src/main/java/com/example/baseball/io/Output.java
@@ -0,0 +1,5 @@
+package com.example.baseball.io;
+
+public interface Output {
+	void print(String toString);
+}
diff --git a/src/main/java/com/example/baseball/strategy/NumberGenerator.java b/src/main/java/com/example/baseball/strategy/NumberGenerator.java
new file mode 100644
index 0000000..808c385
--- /dev/null
+++ b/src/main/java/com/example/baseball/strategy/NumberGenerator.java
@@ -0,0 +1,8 @@
+package com.example.baseball.strategy;
+
+import com.example.baseball.balls.Balls;
+
+@FunctionalInterface
+public interface NumberGenerator {
+	Balls throwing();
+}