diff --git a/assignment/assignment.html b/assignment/assignment.html
index 1dffd5da9e906d2874d252963951bd4a75fb8ce1..9d762a070a0aa57d1fd0c5c9c6a35767d5719e00 100644
--- a/assignment/assignment.html
+++ b/assignment/assignment.html
@@ -152,17 +152,17 @@ http://www.tooplate.com/view/2096-individual
             </article>
 			<article  class="col-xs-6 col-md-4 tm-bg-white-transparent">
               <header><h3 class="tm-bg-white 2"> <a href="assignment13.html"> Assignment 13 </a> </h3>
-               <h3 class="tm-bg-white2"> <a href="assignment13.html">Invention, Intellectual Property and Income</a></h3> </header>
-          <img src="img/CAD.jpg" alt="Lights" style="width:100%">
+               <h3 class="tm-bg-white2"> <a href="assignment13.html">Interface and Application Programming</a></h3> </header>
+          <img src="img/a13_1.jpg" alt="Lights" style="width:100%">
             </article>
 			<article  class="col-xs-6 col-md-4 tm-bg-white-transparent">
               <header><h3 class="tm-bg-white 2"> <a href="assignment14.html"> Assignment 14 </a> </h3>
-               <h3 class="tm-bg-white2"> <a href="assignment14.html">Networking and Communications</a></h3> </header>
-          <img src="img/CAD.jpg" alt="Lights" style="width:100%">
+               <h3 class="tm-bg-white2"> <a href="assignment14.html">Invention, Intellectual Property and Income </a></h3> </header>
+          <img src="img/a14_1.jpg" alt="Lights" style="width:100%">
             </article>
 			<article  class="col-xs-6 col-md-4 tm-bg-white-transparent">
               <header><h3 class="tm-bg-white 2"> <a href="assignment15.html"> Assignment 15 </a> </h3>
-               <h3 class="tm-bg-white2"> <a href="assignment15.html">Interface and Application Programming</a></h3> </header>
+               <h3 class="tm-bg-white2"> <a href="assignment15.html">Networking and Communications </a></h3> </header>
           <img src="img/CAD.jpg" alt="Lights" style="width:100%">
             </article>
 			<article  class="col-xs-6 col-md-4 tm-bg-white-transparent">
diff --git a/assignment/assignment12.html b/assignment/assignment12.html
index 4488f4f3e1cc7b12fdd2d0417205d2dd8125b702..2685a9902d9d189e39ca677a22fe4af81745f4b3 100644
--- a/assignment/assignment12.html
+++ b/assignment/assignment12.html
@@ -288,7 +288,7 @@ There will be littel bit changes I may do according to need.   </strong> </p>
 									<h2> <a href="assignment13.html">Assignment 13:Interface and Application Programming</a></h2>
 								</header>
 								<div> <a href="assignment11.html" class="image full"><img src="img/" alt=""></a> </div>
-								<p></p>
+								<p>An application program interface (API) is a set of routines, protocols, and tools for building software applications.</p>
 							</section>
 						</div>
 						<div class="3u">
diff --git a/assignment/assignment13.html b/assignment/assignment13.html
new file mode 100644
index 0000000000000000000000000000000000000000..790adaeb3830f8f866959c941b395b782f9f8828
--- /dev/null
+++ b/assignment/assignment13.html
@@ -0,0 +1,348 @@
+<!DOCTYPE HTML>
+<!--
+	Synchronous by TEMPLATED
+    templated.co @templatedco
+    Released for free under the Creative Commons Attribution 3.0 license (templated.co/license)
+-->
+<html>
+	<head>
+		<title>Assignment 13 </title>
+		<meta http-equiv="content-type" content="text/html; charset=utf-8" />
+		<meta name="description" content="" />
+		<meta name="keywords" content="" />
+		<link href='http://fonts.googleapis.com/css?family=Lato:300,400,700,900' rel='stylesheet' type='text/css'>
+		<!--[if lte IE 8]><script src="js/html5shiv.js"></script><![endif]-->
+		<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
+		<script src="js/skel.min.js"></script>
+		<script src="js/skel-panels.min.js"></script>
+		<script src="js/init.js"></script>
+		<noscript>
+			<link rel="stylesheet" href="css/skel-noscript.css" />
+			<link rel="stylesheet" href="css/style.css" />
+		</noscript>
+		<!--[if lte IE 8]><link rel="stylesheet" href="css/ie/v8.css" /><![endif]-->
+		<!--[if lte IE 9]><link rel="stylesheet" href="css/ie/v9.css" /><![endif]-->
+	</head>
+	<body class="homepage">
+		<div id="wrapper">
+			
+			<!-- Header -->
+			<div id="header">
+				<div class="container"> 
+					
+					<!-- Logo -->
+					<div id="logo">
+					
+						<h1><a > Interface and Application Programming</a></h1>
+						<span>Assignment 13</span>
+					</div>
+					
+					<!-- Nav -->
+					<nav id="nav">
+						<ul>
+							<li class="active"><a href="..//index.html">Home</a></li>
+							<li><a href="..//about me.html">About Me</a></li>
+							<li><a href="assignment.html">Assignment</a></li>
+							<li><a href="..//my project.html">My Project</a></li>
+							<li><a href="..//contact.html">Contact Us</a></li>
+						</ul>
+					</nav>
+				</div>
+			</div>
+			<!-- /Header -->
+			
+			<div id="page">
+				<div class="container">
+					<div class="row">
+							<div class="9u skel-cell-important">
+							<section id="content" >
+								<header>
+								<h2 style="color:blue">Interface and Application Programming</h2>
+									
+									<h4 id="Week Task" style="border-bottom: 6px solid yellow; background-color: lightgrey" > <strong>Week Task</strong>  </h4>
+									<p style="justify-content: center"><strong> Individual assignment:write an application that interfaces a user with an input &/or output device that you made <br>
+                                    group assignment:compare as many tool options as possible </strong> </p>
+ 
+									<h4 id="Introduction" style="border-bottom: 6px solid yellow; background-color: lightgrey" > <strong>Introduction </strong>  </h4>
+								<p style="justify-content: center"><strong> It is a software intermediary that allows two applications to talk to each other. An application program interface (API) is a set of routines, protocols, and tools for building software applications.
+								Basically, an API specifies how software components should interact. Additionally, APIs are used when programming graphical user interface (GUI) components. 
+								A good API makes it easier to develop a program by providing all the building blocks. A programmer then puts the blocks together    </strong> </p>
+								 <div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_1.png" width="80%"
+                                   height="250" class="svg__image"> </div>
+									  <br> 
+								 													   						  
+								   <h4 id="individual"  style="border-bottom: 6px solid yellow; background-color: lightgrey" > <strong>Individual Assignment</strong>  </h4>  
+								   <p style="justify-content: center"><strong> The task for the week is to write an application that interfaces a user with an input &/or output device that we made. For this week I have
+								   tried to develop the app for ON and OFF the Inner and Outer Fan use in my final project. The app is developed usign MIT App Inventor. So lets discuss how the app developed.</strong> </p> <br> <br>
+
+                                 <h4 id="app"  style="border-bottom: 6px solid yellow; background-color: lightgrey" > <strong>App Development</strong>  </h4>  
+								   <p style="justify-content: center"><strong> The app is developed using MIT App Inventor. MIT App Inventor is an intuitive, visual programming environment that allows everyone to build fully functional apps for smartphones and tablets. 
+								   Those new to MIT App Inventor can have a simple first app up and running in less than 30 minutes. And what's more, there is a blocks-based tool facilitates the creation of complex, high-impact apps in significantly less time than traditional 
+								   programming environments. The MIT App Inventor project seeks to democratize software development by empowering all people, especially young people, to move from technology consumption to technology creation. <br>
+								    Let's browse the MIT app inventor on google and open it website. For App creation its need to sign in using Google Account. </strong> </p> 
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_2.png" width="75%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									<p style="justify-content: center"><strong> For App creation its need to sign in using Google Account.So here I am using my google account to sign in.</strong> </p>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_3.png" width="75%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									<p style="justify-content: center"><strong> After login, the following windows will get open. The section available in the windows are as follows: <br>
+									1. Palette(At left side): This can provides the different range of shapes, user interface, layput, media, drawing and animation, maps, sensor, social etc. 
+									which can work as css like in website development. <br>
+									2. Viewer (At center): Will show the screen mobile, which can show the view of app on mobile screen. <br>
+									3. Component (At right side):It can shows the palette used for apps means whatever lables buttons and component we are picked for building the app. <br>
+									4. Properties (At right side): Here we can specify the properties of the components such as the font, height and width, background colour or image etc.<br>
+									5. Screen (At top): There is a button for to show the screen number, to add new screen or to remove any screen.</strong> </p>
+									
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_4.png" width="75%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									<p style="justify-content: center"><strong> Here I am selecting following components for the screen one. This is the first screen, so here i will only the name of the project, one image is added to the background,
+									second is added in button i.e. of chimney, open button is added to open the next screen. So here only open button is active, when we click it, next screen i.e. screen 2 will get open.
+									So during coding we have to code it as like this. </strong> </p>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_5.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									<p style="justify-content: center"><strong> Now, we have to put a code for this screen, i.e. when we click open button, screen 2 will get open. So click on the "Block" button,
+                               which is at the right top, programm screen will get open, here we have to write the code,using this different block. Here i have selected the two command of "when and do" and "open another screen screeName" from control block.
+                                 and selected also one next command from Text block. In this block i have write name "Screen 2" to open this screen.							   </strong> </p>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_6.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									<p style="justify-content: center"><strong> The Screen 2, is for Login in the app. so here I have use the block for UserName and Password. The following block used for this screen and put the title of the 
+									screen is "Please Login" which is at the top.</strong> </p>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_7.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+                              <p style="justify-content: center"><strong> After putting the userName and Password,then click the login Button.</strong> </p>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_8.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									<p style="justify-content: center"><strong> Now click on the Block to write the code for this screen.When screen 2 will get open, textbox will provided to write userName, the userName is "abcd" and password box is give 
+									to write password. Then click on Login, to open the next screen, i.e. Screen 3. For this function written as belows</strong> </p>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_9.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									<p style="justify-content: center"><strong> After Login,Screen 3 will get open, here firstly we have to connect with hardware through Bluetooth. 
+                                   In case of my project I have to ON and OFF the fan of smart kitchen chimeny through the app. So here I have provide the button to ON/OFF the Inner and Outer Fan. <br>
+                                    So firstly click on the bluetooth, it will get connect to the Bluetooth model of hardware. Will get the alert at the top whether connected or disconnected. <br>
+									Then click the button to ON and OFF the Inner and Outer fan.
+ 									</strong> </p>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_10.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+  					              <p style="justify-content: center"><strong> Then click on Block to write the code for this function. <br>
+								  There is a three in this code, first one to connect with bluetooth, then ON/OFF Inner Fan and ON/OFF Outer Fan.</strong> </p>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_11.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									 <p style="justify-content: center"><strong> Now the apps is ready to use. So click on "Build">create the QR code and save the .apk file in computer.</strong> </p>
+									 <div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_12.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									
+									 <p style="justify-content: center"><strong> The QR code is generation for the app. </strong> </p>
+									 <div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_13.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+									<div class="row">
+                                       <div class="col">
+                                       <div class="card text-center">
+                                       <div class="oval"><img src="image/a13_14.png" width="60%"
+                                   height="350" class="svg__image"> </div>
+									<br> <br>
+ <p style="justify-content: center"><strong> To download the apps in mobile i have followed the following steps <br>
+									 Step 1: Open the andriod mobile. Downloaded and installed the MIT AI2 Companion App on phone. <br>
+									 Step 2: On your device, launch the MIT App Companion app just as you would do any app. Then click the “Scan QR code” button on the Companion, and scan the code in the App Inventor window <br>
+									 Step 3: The app start download. The developed app will get download in mobile, it will ready to use. 
+									 </strong> </p>
+									  <!DOCTYPE html>
+<html>
+<head>
+<style>
+* {
+  box-sizing: border-box;
+}
+
+.column {
+  float: left;
+  width: 33.33%;
+  padding: 5px;
+}
+
+/* Clearfix (clear floats) */
+.row::after {
+  content: "";
+  clear: both;
+  display: table;
+}
+</style>
+</head>
+									<div class="row">
+<div class="column">
+    <img src="image/a13_15.jpg" alt="Snow" style="width:100%">
+  </div>
+  <div class="column">
+    <img src="image/a13_16.jpg" alt="Snow" style="width:100%">
+  </div>
+    <div class="column">
+    <img src="image/a13_17.jpg" alt="Snow" style="width:100%">
+  </div>
+  <br> <br>
+  <p style="justify-content: center"><strong> Open the app in android mobile, here is the three screen of the app will get open .	 </strong> </p>
+ 	<div class="row">
+	<div class="column">
+    <img src="image/a13_18.jpg" alt="Forest" style="width:100%">
+  </div>
+    <div class="column">
+    <img src="image/a13_19.jpg" alt="Mountains" style="width:100%">
+  </div>
+  <div class="column">
+    <img src="image/a13_20.jpg" alt="Mountains" style="width:100%">
+  </div>
+</div>
+<br> <br>
+</html>
+<br> <br>
+
+									
+
+						<h4 id="What i learn" style="border-bottom: 6px solid yellow; background-color: lightgrey" > <strong> What i learn? </strong> </h4>
+							
+							<p style="justify-content: center"><strong> I am learn about <br>
+							1. App developemnt using MIT App Inventor <br>
+							2. About Interface and Application programming <br>
+							3. Different tool, languages used for Developing Interface. </strong> </p>
+								 
+								  <a style="color:mediumvioletred" class="btn-new rom-middle animated" href="./file/file13.zip">Download my original file here</a> <br> <br>
+									  <p>Go to the <a href="#Introduction">top</a></p>
+								  </section>
+						           </div>
+						    
+						<div class="3u">
+							<section id="sidebard2">
+								<header>
+									<h2>Content</h2>
+								</header>
+								<ul class="style1">
+								<li class="first"><span class="fa fa-check"></span><a href="#Week Task">Week Task</a> </li> <br>
+								<li><span class="fa fa-check"></span><a href="#Introduction">Introduction</a></li><br>
+									<li><span class="fa fa-check"></span><a href="#individual">Individual Assignment</a></li><br>
+									<li><span class="fa fa-check"></span><a href="#app">App Development</a> </li><br>
+									<li><span class="fa fa-check"></span><a href="#What i learn"> What I learn?</a> </li><br>
+									
+								</ul>
+								
+							</section>
+						</div>
+					</div>
+
+				</div>	
+			</div>
+
+			<!-- Footer -->
+			<div id="footer">
+				<div class="container">
+					<div class="row">
+						<div class="3u">
+							<section id="box1">
+								<header>
+									<h2>Back</h2>
+								</header>
+								<ul class="style1">
+								<li class="first"><a href="assignment12.html">Assignment 12</a></li> <br>
+								<li><a href="assignment11.html">Assignment 11</a></li> <br>
+								<li><a href="assignment10.html">Assignment 10</a></li> <br>
+								<li><a href="assignment9.html">Assignment 9</a></li> <br>
+								<li><a href="assignment8.html">Assignment 8</a></li> <br>
+								<li><a href="assignment7.html">Assignment 7</a></li> <br>
+								<li><a href="assignment6.html">Assignment 6</a></li> <br>
+								<li><a href="assignment5.html">Assignment 5</a></li> <br>
+								<li><a href="assignment4.html">Assignment 4</a></li> <br>
+								
+										
+								</ul>
+							</section>
+						</div>
+						<div class="6u">
+							<section id="box2">
+								<header>
+									<h2> <a href="assignment13.html">Assignment 14:Invention, Intellectual Property and Income </a></h2>
+								</header>
+								<div> <a href="assignment11.html" class="image full"><img src="img/" alt=""></a> </div>
+								<p></p>
+							</section>
+						</div>
+						<div class="3u">
+							<section id="box3">
+								<header>
+									<h2>Next</h2>
+								</header>
+								<ul class="style1">					
+									<li class="first"><a href="assignment14.html">Assignment 14</a></li> <br>
+									<li><a href="assignment15.html">Assignment 15</a></li> <br>
+									<li><a href="assignment16.html">Assignment 16</a></li> <br>
+									<li><a href="assignment17.html">Assignment 17</a></li> <br>
+									<li><a href="assignment18.html">Assignment 18</a></li> <br>
+									<li><a href="assignment19.html">Assignment 19</a></li> <br>
+									<li><a href="assignment1.html">Assignment 1</a></li> <br>
+									<li><a href="assignment2.html">Assignment 2</a></li> <br>
+									<li><a href="assignment3.html">Assignment 3</a></li> <br>
+									
+								</ul>
+							</section>
+						</div>
+					</div>
+				</div>
+			</div>
+
+			<!-- Copyright -->
+			<div id="copyright">
+				<div class="container">
+					Design: <a href="http://templated.co">TEMPLATED</a> Images: <a href="http://unsplash.com">Unsplash</a> (<a href="http://unsplash.com/cc0">CC0</a>)
+				</div>
+			</div>
+			
+		</div>
+	</body>
+</html>
\ No newline at end of file
diff --git a/assignment/assignment6.html b/assignment/assignment6.html
index 55cc2ce65ff5aef6a365d6f3568b4890b9fe4fc4..b9295d0d28a69aa6d35bdffd1630546b7d2d0674 100644
--- a/assignment/assignment6.html
+++ b/assignment/assignment6.html
@@ -86,7 +86,7 @@
                                     Power Failure ressurection - Never lose a print to power failures again. <br>
 									Multi Filament Capability: PLA, ABS, Flexible, Composite Materials (Wood Fill, Bronze Fill, etc), Nylon 618 <br>
 									The details about Group Assignment is given on our group member  page<br>
-								   <a href= "http://fabacademy.org/2020/labs/vigyanashram/students"> Click here for details about 5-Week Group Assignment </a>
+								   <a href= "http://fabacademy.org/2020/labs/vigyanashram/students/snehal-gawali/assignment5/assignment5.html"> Click here for details about 5-Week Group Assignment </a>
                                     </strong> </p>
 								       <div class="row">
                                        <div class="col">
@@ -363,7 +363,7 @@
                                  ABS is a strong and heat resistant filament, with awesome post processing options. ABS also offers the possibility of a good surface finish. ABS reacts to acetone, which tends to smooth and polish the surface.
 								 It’s also a lot easier to sand ABS.  <br> <br>
 								 3.  Is this printed object is the part of project or if yes please mention.<br>
-								 Ans:  NO. The object is not the part of project. <br> <br>
+								 Ans:  NO. The object is not the part of project. </strong> </p> <br> <br>
 
 								   
 									  <a style="color:mediumvioletred" class="btn-new rom-middle animated" href="./file/file5.zip">Download my original file here</a> <br> <br>
diff --git a/assignment/file/file13.zip b/assignment/file/file13.zip
new file mode 100644
index 0000000000000000000000000000000000000000..e17edeb761fe0fa9ac4790dcbdfb8d442f48ab7e
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diff --git a/assignment/image/a13_1.png b/assignment/image/a13_1.png
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