diff --git a/starter_code/elevator.js b/starter_code/elevator.js
index 5339f35..c158324 100644
--- a/starter_code/elevator.js
+++ b/starter_code/elevator.js
@@ -1,19 +1,93 @@
 class Elevator {
-  constructor(){
-    this.floor      = 0;
-    this.MAXFLOOR   = 10;
-    this.requests   = [];
+  constructor() {
+    this.floor = 0;
+    this.MAXFLOOR = 10;
+    this.waitingList = [];
+    this.passengers = [];
+    this.requests = [];
+    this.direction = "up";
+    this.setInterval;
+  }
+  start() {
+    this.setInterval = setInterval(() => {
+      this.update();
+      if (this.direction == "up") {
+        this.floorUp();
+      }else {this.floorDown()}
+    }, 1000);
+  }
+  stop() {
+    clearInterval(this.setInterval);
+    this.checkWaitingList();
+    this.checkPassengersList();
+    if(this.requests.length > 0){
+    this.start()}
+  }
+  update() {
+    if (this.requests.length == 0){
+      this.stop()
+      console.log ("no one left in the elevator");
+    }
+    return this.log();
+  }
+  _passengersEnter(ind) {
+    this.passengers.push(this.waitingList[ind]);
+    console.log(this.waitingList[ind].name + " has enter the elevator");
+    this.requests.push(this.waitingList[ind].destinationFloor);
+    this.waitingList.splice(ind, 1);
+  }
+  _passengersLeave(ind) {
+    console.log(this.passengers[ind].name + " has left the elevator");
+    this.passengers.splice(ind, 1);
+  }
+  floorUp() {
+    this.checkRequestsList();
+    if (this.floor < this.MAXFLOOR && this.direction == "up") {
+      this.floor++;
+    } else {
+      this.direction = "down";
+      this.floorDown();
+    }
   }
 
-  start() { }
-  stop() { }
-  update() { }
-  _passengersEnter() { }
-  _passengersLeave() { }
-  floorUp() { }
-  floorDown() { }
-  call() { }
-  log() { }
+  floorDown() {
+    this.checkRequestsList();
+    if (this.floor > 0 && this.direction == "down") {
+      this.floor--;
+    } else {
+      this.direction = "up";
+      this.floorUp();
+    }
+  }
+  call(person) {
+    this.waitingList.push(person);
+    this.requests.push(person.originFloor);
+  }
+  log() {
+    console.log(this.floor);
+  }
+  checkWaitingList() {
+    for (let i = 0; i < this.waitingList.length; i++) {
+      if (this.waitingList[i].originFloor == this.floor) {
+        this._passengersEnter(i);
+      }
+    }
+  }
+  checkPassengersList() {
+    for (let i = 0; i < this.passengers.length; i++) {
+      if (this.passengers[i].destinationFloor == this.floor) {
+        this._passengersLeave(i);
+      }
+    }
+  }
+  checkRequestsList() {
+    for (let i = 0; i < this.requests.length; i++) {
+      if (this.floor == this.requests[i]) {
+        this.requests.splice(i,1);
+        this.stop();
+      }
+    }
+  }
 }
 
 module.exports = Elevator;
diff --git a/starter_code/index.js b/starter_code/index.js
index 5e480eb..ccb9f1c 100644
--- a/starter_code/index.js
+++ b/starter_code/index.js
@@ -1 +1,17 @@
 const Elevator = require('./elevator.js');
+const Person = require('./person.js');
+
+let elevator1 = new Elevator();
+let person1 = new Person("alice",2,3)
+let person2 = new Person("juan",2,1)
+let person3 = new Person("pepe",2,7)
+let person4 = new Person("jose",8,1)
+let person5 = new Person("pedro",6,2)
+elevator1.call(person1)
+elevator1.call(person2)
+elevator1.call(person3)
+elevator1.call(person4)
+elevator1.call(person5)
+
+
+elevator1.start();
diff --git a/starter_code/person.js b/starter_code/person.js
index fddcc22..3ccf0cb 100644
--- a/starter_code/person.js
+++ b/starter_code/person.js
@@ -1,5 +1,8 @@
 class Person {
   constructor(name, originFloor, destinationFloor){
+  this.name = name;
+  this.originFloor = originFloor;
+  this.destinationFloor = destinationFloor;
   }
 }