diff --git a/README.md b/README.md
index 93afe8b..b93d9e4 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,44 @@
 ECONOVATION HEROES 2기 2기 Java Racing Game Practice
+
+#####step1
+- 접근제어자 접근 범위를 생각하고 사용하기
+- CamelCase 따르기
+- 스터디 규칙 : 모든 변수명은 줄여쓰지 않는다
+- 불필요한 공백 포함하지 않기
+- Java 는 메모리를 직접 접근하여 해제하지 않고 Garbage Collector 를 사용하여
+ 메모리 해제함.
+ 
+ #####step2
+ - primitive 타입과 wrapper 타입의 차이점 
+ - 게임의 룰은 어떤 클래스에 적용할 것인가?
+ - code formatting 습관 들이기
+ - magic number 상수로 추출(상수는 네이밍은 대문자로 하는 것이 룰)
+ - 의존성 측면 고려하고 코드짜기
+ 
+ ######refactoring: 
+ - InputView 클래스 상수 타입 변환
+ - Race 클래스 상수 네이밍 대문자 처리
+ - CamelCase에 따라 네이밍 고치기
+ - 게임의 룰을 관리할 Rule 클래스 생성
+ - setter 사용 지양
+ - 불필요한 코드 주석 및 공백 제거
+ - stream api 적용
+ - 게임 시작을 위한 input 과 관련된 print 는 inputview로 옮기기
+ - View 에 대한 책임을 Main(RacingGame) 으로 위임
+ - InputView static 메소드로 구성하여 객체 생성 비용을 절감하기
+ (추가)
+ - 메서드 체이닝을 적용해서 Arrays.stream(trimmedInputCarName).forEach(~~)
+  로 이어 붙이기
+ - util 목적으로 사용하실 클래스 객체 생성 비용 줄이기
+ - 의미없는 메모리 낭비 없애기
+ - 가독성에 유리하게 선언과 할당 같은 곳에서 해주기
+ - 테스트 코드
+ ###### 해결할 문제
+
+ 테스트 코드를 작성하다보니 public으로만 테스트가 안된다는 점에서 코드가 잘 짜여지지 않다고 느꼈다.
+ 테스트 코드를 먼저 작성하고 그에 맞추어 코드를 작성해야할까?
+ 
+ 
+ 
+
+ 
diff --git a/src/Car.java b/src/Car.java
new file mode 100644
index 0000000..366cefc
--- /dev/null
+++ b/src/Car.java
@@ -0,0 +1,21 @@
+public class Car {
+    private String name;
+    private int position;
+
+    Car(String name) {
+        this.name = name;
+        this.position = 0;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getPosition() {
+        return position;
+    }
+
+    public void goForward() {
+        this.position++;
+    }
+}
diff --git a/src/InputView.java b/src/InputView.java
new file mode 100644
index 0000000..f06dca1
--- /dev/null
+++ b/src/InputView.java
@@ -0,0 +1,68 @@
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Scanner;
+import java.util.stream.Stream;
+
+public class InputView {
+    private static final int MAX_LENGTH = 6;
+    private static final Scanner scanner = new Scanner(System.in);
+
+    public static List<Car> inputCarName() {
+        String name = scanner.nextLine();
+        String[] splittedInputCarName = splitInputCarName(name);
+        String[] trimmedInputCarName = trimInputCarName(splittedInputCarName);
+
+        try {
+            processStreamAboutCheckName(trimmedInputCarName);
+        } catch(IllegalArgumentException e) {
+            System.out.println(e.getMessage());
+            inputCarName();
+        }
+
+        List<Car> cars = new ArrayList<>();
+        for(int i = 0; i< splittedInputCarName.length; i++) {
+            cars.add(new Car(trimmedInputCarName[i]));
+        }
+        return cars;
+    }
+
+    private static String[] splitInputCarName(String name) {
+        return name.split(",");
+    }
+
+    private static String[] trimInputCarName(String[] name) {
+        for(int i = 0; i<name.length; i++) {
+            name[i] = name[i].trim();
+        }
+        return name;
+    }
+
+    private static void checkNameLength(String name) {
+        if(name.length() >= MAX_LENGTH) {
+            throw new IllegalArgumentException("이름은 5자 이하만 가능합니다.");
+        }
+    }
+
+    private static void processStreamAboutCheckName(String[] trimmedInputCarName) {
+        Stream<String> stream = Arrays.stream(trimmedInputCarName);
+        stream.forEach(e -> checkNameLength(e));
+    }
+
+    public static int inputTrial() {
+        return scanner.nextInt();
+    }
+
+    public static void inputCarNamesMessage() {
+        System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)");
+    }
+
+    public static void inputCountMessage() {
+        System.out.println("시도할 횟수는 몇회인가요?");
+    }
+}
+
+
+
+
+
diff --git a/src/OutputView.java b/src/OutputView.java
new file mode 100644
index 0000000..f1038e2
--- /dev/null
+++ b/src/OutputView.java
@@ -0,0 +1,27 @@
+import java.util.List;
+
+public class OutputView {
+    private static final String DRIVE = "-";
+
+    public void resultMessage() {
+        System.out.println("\n실행 결과");
+    }
+
+    public void oneTrialMessage(List<Car> cars) {
+        for(Car car: cars) {
+            System.out.println(car.getName() + ": " + raceOneTrial(car));
+        }
+    }
+
+    private StringBuilder raceOneTrial(Car car) {
+        StringBuilder goSignal = new StringBuilder();
+        for(int i = 0; i<car.getPosition(); i++) {
+            goSignal.append(DRIVE);
+        }
+        return goSignal;
+    }
+
+    public void getWinnerMessage(List<String> winnernames) {
+        System.out.println(String.join(",", winnernames + "가 최종 우승했습니다."));
+    }
+}
diff --git a/src/RacingGame.java b/src/RacingGame.java
new file mode 100644
index 0000000..8025f11
--- /dev/null
+++ b/src/RacingGame.java
@@ -0,0 +1,39 @@
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class RacingGame {
+    private List<String> winnernames = new ArrayList<>();
+
+    public void race(List<Car> cars) {
+        for(Car car: cars) {
+            goOrStay(car);
+        }
+    }
+
+    private void goOrStay(Car car) {
+        if(Rule.isGoForward()) {
+            car.goForward();
+        }
+    }
+
+    public List<String> getWinner(List<Car> cars) {
+        int positionOfWinner = findPositionOfWinner(cars);
+        cars = cars.stream().filter(car -> (car.getPosition() == positionOfWinner)).collect(Collectors.toList());
+        for (Car car : cars) {
+            this.winnernames.add(car.getName());
+        }
+        return winnernames;
+    }
+
+    private int findPositionOfWinner(List<Car> cars) {
+        List<Integer> position = new ArrayList<>();
+        int positionOfWinner;
+        for(Car car: cars) {
+            position.add(car.getPosition());
+        }
+        positionOfWinner = Collections.max(position);
+        return positionOfWinner;
+    }
+}
\ No newline at end of file
diff --git a/src/RacingMain.java b/src/RacingMain.java
new file mode 100644
index 0000000..7d4c83f
--- /dev/null
+++ b/src/RacingMain.java
@@ -0,0 +1,26 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class RacingMain {
+    public static void main(String[] args) {
+        OutputView outputView = new OutputView();
+        RacingGame racingGame = new RacingGame();
+        List<Car> cars = new ArrayList<>();
+        int trial;
+
+        InputView.inputCarNamesMessage();
+        cars = InputView.inputCarName();
+        InputView.inputCountMessage();
+        trial = InputView.inputTrial();
+
+        for(int i = 0; i < trial; i++) {
+            outputView.resultMessage();
+            racingGame.race(cars);
+            outputView.oneTrialMessage(cars);
+        }
+
+        outputView.getWinnerMessage(racingGame.getWinner(cars));
+    }
+}
+
+
diff --git a/src/Rule.java b/src/Rule.java
new file mode 100644
index 0000000..04deb34
--- /dev/null
+++ b/src/Rule.java
@@ -0,0 +1,14 @@
+import java.util.Random;
+
+public class Rule {
+    private static final int BOUNDARYNUMBER = 10;
+    private static final int GOFORWARDCONDITION = 4;
+
+    public static boolean isGoForward() {
+        Random random = new Random();
+        if(random.nextInt(BOUNDARYNUMBER) >= GOFORWARDCONDITION) {
+            return true;
+        }
+        return false;
+    }
+}
diff --git a/test/InputViewTest.java b/test/InputViewTest.java
new file mode 100644
index 0000000..6a939c2
--- /dev/null
+++ b/test/InputViewTest.java
@@ -0,0 +1,51 @@
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.assertThat;
+
+public class InputViewTest {
+    List<Car> cars;
+    @Before
+    public void setUp() throws Exception {
+        cars = new ArrayList<>();
+        cars.add(new Car("애플"));
+        cars.add(new Car("삼성"));
+        cars.add(new Car("전남대"));
+    }
+
+    @Test
+    public void inputCarName() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
+        String carName = "애플, 삼성, 전남대";
+        InputView inputView = new InputView();
+        try {
+            Method methodsplit = inputView.getClass().getDeclaredMethod("splitInputCarName", String.class);
+            methodsplit.setAccessible(true);
+            Method methodtrim = inputView.getClass().getDeclaredMethod("trimInputCarName", String[].class);
+            methodtrim.setAccessible(true);
+            String[] name = (String[]) methodsplit.invoke(inputView, carName);
+            String[] name1 = (String[]) methodtrim.invoke(inputView, (Object) name);
+            assertThat("애플", is(name1[0]));
+            assertThat("삼성", is(name1[1]));
+            assertThat("전남대", is(name1[2]));
+        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void inputTrial() {
+
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        cars = null;
+    }
+}
\ No newline at end of file
diff --git a/test/RaceTest.java b/test/RaceTest.java
new file mode 100644
index 0000000..5d39304
--- /dev/null
+++ b/test/RaceTest.java
@@ -0,0 +1,12 @@
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class RaceTest {
+    @Test
+    public void getWinner() {
+
+    }
+
+
+}
\ No newline at end of file
diff --git a/test/RacingGameTest.java b/test/RacingGameTest.java
new file mode 100644
index 0000000..08ebf3c
--- /dev/null
+++ b/test/RacingGameTest.java
@@ -0,0 +1,49 @@
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+public class RacingGameTest {
+        List<Car> cars;
+        RacingGame racingGame;
+    @Before
+    public void setUp() throws Exception {
+        cars = new ArrayList<>();
+        cars.add(new Car("애플"));
+        cars.add(new Car("삼성"));
+        cars.add(new Car("전남대"));
+        racingGame = new RacingGame();
+    }
+
+    @Test
+    public void race() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
+        Method goOrStay = racingGame.getClass().getDeclaredMethod("goOrStay", Car.class);
+        goOrStay.setAccessible(true);
+        for(Car car: cars) {
+            goOrStay.invoke(racingGame, car);
+        }
+    }
+
+    @Test
+    public void getWinner() {
+        cars.get(0).goForward();
+        cars.get(1).goForward();
+        List<String> expectedWinnerNames = new ArrayList<>();
+        expectedWinnerNames.add("애플");
+        expectedWinnerNames.add("삼성");
+        List<String> actualWinnerNames = racingGame.getWinner(cars);
+        assertThat(actualWinnerNames,is(expectedWinnerNames));
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        cars = null;
+    }
+}
\ No newline at end of file
diff --git a/test/RuleTest.java b/test/RuleTest.java
new file mode 100644
index 0000000..c807a2a
--- /dev/null
+++ b/test/RuleTest.java
@@ -0,0 +1,12 @@
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.either;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.*;
+
+public class RuleTest {
+    @Test
+    public void isGoForward() {
+        assertThat(Rule.isGoForward(),either(is(true)).or(is(false)) );
+    }
+}
\ No newline at end of file