diff --git a/.circleci/config.yml b/.circleci/config.yml
index 42c27b22c..2f8945d91 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -69,6 +69,21 @@ jobs:
           key: dependency-cache-{{ checksum "package.json" }}
           paths:
             - node_modules
+  st-storage-layout-check:
+    docker:
+      - image: maxsam4/solidity-kit
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+      - run: yarn install
+      - run: node --version
+      - run: truffle version
+      - run: npm run st-storage-layout-check
+      - save_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+          paths:
+            - node_modules
   docs:
     docker:
       - image: maxsam4/solidity-kit
@@ -90,6 +105,7 @@ workflows:
     jobs:
       - coverage
       - clash-check
+      - st-storage-layout-check
   daily-builds:
     triggers:
       - schedule:
diff --git a/contracts/tokens/OZStorage.sol b/contracts/tokens/OZStorage.sol
index 01e415c0a..b61cf0ec0 100644
--- a/contracts/tokens/OZStorage.sol
+++ b/contracts/tokens/OZStorage.sol
@@ -1,12 +1,17 @@
 pragma solidity ^0.5.0;
 
+/* 
+ * @dev It is the contract that contains the storage items related to the ERC20 contract implementaiton
+ * of the openzeppelin-solidity. Used to allow the storage declaration of ERC20 to the STGetter contract
+*/
+
 contract OZStorage {
 
-    mapping (address => uint256) public _balances;
+    mapping (address => uint256) private _balances;
 
-    mapping (address => mapping (address => uint256)) public _allowed;
+    mapping (address => mapping (address => uint256)) private _allowed;
 
-    uint256 public _totalSupply;
+    uint256 private _totalSupply;
 
     /// @dev counter to allow mutex lock with only one SSTORE operation
     uint256 private _guardCounter;
@@ -19,4 +24,8 @@ contract OZStorage {
         return _balances[_investor];
     }
 
+    function _allowance(address owner, address spender) internal view returns(uint256) {
+        return _allowed[owner][spender];
+    }
+
 }
diff --git a/contracts/tokens/STGetter.sol b/contracts/tokens/STGetter.sol
index 19960f4be..9b34272e1 100644
--- a/contracts/tokens/STGetter.sol
+++ b/contracts/tokens/STGetter.sol
@@ -212,7 +212,7 @@ contract STGetter is OZStorage, SecurityTokenStorage {
      * @return Whether the `_operator` is an operator for all partitions of `_tokenHolder`
      */
     function isOperator(address _operator, address _tokenHolder) external view returns (bool) {
-        return (_allowed[_tokenHolder][_operator] == uint(-1));
+        return (_allowance(_tokenHolder, _operator) == uint(-1));
     }
 
     /**
diff --git a/package.json b/package.json
index 9eaf3e5a4..a88497524 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,8 @@
     "flatten-all": "npm run flatten-modules && npm run flatten-token && npm run flatten-mocks && npm run flatten-oracles && npm run flatten-proxies && npm run flatten && npm run flatten-proxyFactories",
     "ethereum-bridge": "node_modules/.bin/ethereum-bridge -H localhost:8545 -a 9 --dev",
     "st20generator": "node demo/ST20Generator",
-    "pretty": "prettier --write --print-width 140 --tab-width 4 \"**/*.js\""
+    "pretty": "prettier --write --print-width 140 --tab-width 4 \"**/*.js\"",
+    "st-storage-layout-check": "node scripts/compareStorageLayout.js SecurityToken STGetter"
   },
   "repository": {
     "type": "git",
@@ -84,7 +85,6 @@
     "mocha-junit-reporter": "^1.18.0",
     "openzeppelin-solidity": "2.2.0",
     "prettier": "^1.15.3",
-    "prompt": "^1.0.0",
     "request": "^2.88.0",
     "request-promise": "^4.2.2",
     "sol-merger": "^0.1.2",
diff --git a/scripts/compareStorageLayout.js b/scripts/compareStorageLayout.js
index 9faf22692..6b08defa3 100644
--- a/scripts/compareStorageLayout.js
+++ b/scripts/compareStorageLayout.js
@@ -1,47 +1,48 @@
 const fs = require("fs");
 const _ = require("underscore");
 const solc = require("solc");
-const prompt = require("prompt");
 const path = require("path");
 const util = require("util");
 const exec = util.promisify(require("child_process").exec);
 
-console.log(`Mandatory: Solc cli tool should be installed globally. Please put the contract name only`);
-prompt.start();
+console.log(`Mandatory: Solc cli tool should be installed globally. Please put the contract name only in any order`);
 
-prompt.get(["LogicContract", "ProxyContract"], async (err, result) => {
-    let temp;
-    let logicFilePath;
-    let proxyFilePath; 
+let contractA = process.argv.slice(2)[0];
+let contractB = process.argv.slice(2)[1];
 
-    const fileList = walkSync("./contracts", []);
+compareStorage(contractA, contractB);
+
+async function compareStorage() {
 
-    let paths = findPath(result.LogicContract, result.ProxyContract, fileList);
+    const fileList = walkSync("./contracts", []);
+    let paths = findPath(contractA, contractB, fileList);
 
     if (paths.length == 2) {
         console.log("Contracts exists \n");
 
         await flatContracts(paths);
         let temp;
-        let logicFilePath = `./flat/${path.basename(paths[0])}`;
-        let proxyFilePath = `./flat/${path.basename(paths[1])}`;
+        let contractAPath = `./flat/${path.basename(paths[0])}`;
+        let contractBPath = `./flat/${path.basename(paths[1])}`;
         
-        if (path.basename(paths[0]) === result.LogicContract) {
-            temp = logicFilePath;
-            logicFilePath = proxyFilePath;
-            proxyFilePath = temp;
+        if (path.basename(paths[0]) === contractA) {
+            temp = contractAPath;
+            contractAPath = contractBPath;
+            contractBPath = temp;
         }
 
-        let logicAST = await getAST(logicFilePath);
-        let proxyAST = await getAST(proxyFilePath);
+        let contractAAST = await getAST(contractAPath);
+        let contractBAST = await getAST(contractBPath);
         // Deleting the temp folder (no longer required)
         await flushTemp();
 
-        console.log(compareStorageLayouts(parseContract(logicAST), parseContract(proxyAST)));
+        var result = compareStorageLayouts(parseContract(contractAAST), parseContract(contractBAST));
+        if (!result)
+            process.exit(1);
     } else {
         console.log("Contracts doesn't exists");
     }
-});
+}
 
 function traverseAST(_input, _elements) {
     if (_input.children) {
@@ -101,7 +102,7 @@ function parseContract(input) {
     return orderedStateVariables;
 }
 
-var walkSync = function(dir, filelist) {
+function walkSync(dir, filelist) {
     files = fs.readdirSync(dir);
     filelist = filelist || [];
     files.forEach(function(file) {
@@ -114,7 +115,7 @@ var walkSync = function(dir, filelist) {
     return filelist;
 };
 
-var findPath = function(logicContractName, proxyContractName, fileList) {
+function findPath(logicContractName, proxyContractName, fileList) {
     let paths = new Array();
     for (let i = 0; i < fileList.length; i++) {
         if (