diff --git a/.circleci/config.yml b/.circleci/config.yml
index 2f8945d91..efdf87dd2 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -45,7 +45,7 @@ jobs:
       - run: yarn install
       - run: node --version
       - run: truffle version
-      - run: 
+      - run:
           command: npm run coverage
           no_output_timeout: 1h
       - save_cache:
@@ -65,6 +65,7 @@ jobs:
       - run: node --version
       - run: truffle version
       - run: npm run clash-check
+      - run: npm run istr-check
       - save_cache:
           key: dependency-cache-{{ checksum "package.json" }}
           paths:
diff --git a/package.json b/package.json
index 8221b6035..fe7227dcb 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
   "scripts": {
     "test": "scripts/test.sh 2> /dev/null",
     "clash-check": "node scripts/clashCheck.js",
+    "istr-check": "node scripts/ISTRCheck.js",
     "gas": "scripts/gasUsage.sh",
     "wintest": "scripts\\wintest.cmd",
     "wincov": "scripts\\wincov.cmd",
diff --git a/scripts/ISTRCheck.js b/scripts/ISTRCheck.js
new file mode 100644
index 000000000..9bbaf7f64
--- /dev/null
+++ b/scripts/ISTRCheck.js
@@ -0,0 +1,118 @@
+const fs = require('fs');
+const exec = require('child_process').execSync;
+const chalk = require('chalk');
+
+// These functions/events are allowed to differ. (These are present in STR but not used and hence not defined in ISTR)
+let exceptions = [
+    "getBytes32Value",
+    "getBytesValue",
+    "getAddressValue",
+    "getArrayAddress",
+    "getBoolValue",
+    "getStringValue",
+    "getArrayBytes32",
+    "getUintValue",
+    "getArrayUint",
+    "initialize",
+    "getBytes32Value",
+    "getBytesValue",
+    "getAddressValue",
+    "getArrayAddress",
+    "getBoolValue",
+    "getStringValue",
+    "getArrayBytes32",
+    "getUintValue",
+    "getArrayUint",
+    undefined, // constructor
+];
+
+async function readFiles() {
+    if (!fs.existsSync("./build/contracts/ISecurityTokenRegistry.json")) {
+        console.log(chalk.yellow('Compiling contracts. This may take a while, please wait.'));
+        exec('./node_modules/.bin/truffle compile');
+    }
+    return([
+        JSON.parse(fs.readFileSync(`./build/contracts/ISecurityTokenRegistry.json`).toString()).abi,
+        [
+            ...JSON.parse(fs.readFileSync(`./build/contracts/SecurityTokenRegistry.json`).toString()).abi,
+            ...JSON.parse(fs.readFileSync(`./build/contracts/STRGetter.json`).toString()).abi
+        ]
+    ]);
+}
+
+async function checkISTR() {
+    // Reading ABIs from build files
+    let ABIs = await readFiles();
+
+    // Removing functions/events defined in exceptions array.
+    removeExceptions(ABIs);
+
+    // Removing parameter and return names from ABIs as they can differ.
+    // Only cleaning ABIs of second file as first one can be cleaned in the next loop efficiently.
+    for (let i = 0; i < ABIs[1].length; i++) {
+        cleanABI(ABIs[1][i]);
+    }
+
+    // This function removed duplicate elements from the ABI.
+    // i.e If the signature matches in Interface and the contract, it is removed from the ABI.
+    // This means that the left over elements after this loop are mistakes.
+    for (let i = 0; i < ABIs[0].length; i++) {
+        let fna = cleanABI(ABIs[0][i]);
+        for (let j = 0; j < ABIs[1].length; j++) {
+            let fnb = ABIs[1][j];
+            if (fna.name == fnb.name && fna.type == fnb.type) {
+                if (JSON.stringify(fna) === JSON.stringify(fnb)) {
+                    ABIs[0].splice(i, 1);
+                    ABIs[1].splice(j, 1);
+                    i--;
+                    break;
+                }
+            }
+        }
+    }
+
+    // If there is any element remaining in either ABI, it is an error.
+    if (ABIs[0].length >= 1 || ABIs[1].length > 1) {
+        for (let i = 0; i < ABIs[0].length; i++) {
+            console.log(ABIs[0][i].name);
+        }
+        for (let i = 0; i < ABIs[1].length; i++) {
+            console.log(ABIs[1][i].name);
+        }
+        console.log(chalk.red('The above Functions/events had no match found. Please synchronize the Interface with the contract.'));
+        process.exit(1);
+    }
+}
+
+function cleanABI(element) {
+    if (element.type === 'event') {
+        for(let i = 0; i < element.inputs.length; i++) {
+            element.inputs[i].name = "";
+        }
+    } else if (element.type === 'function') {
+        for(let i = 0; i < element.inputs.length; i++) {
+            element.inputs[i].name = "";
+        }
+        for(let i = 0; i < element.outputs.length; i++) {
+            element.outputs[i].name = "";
+        }
+    }
+    return element;
+}
+
+function removeExceptions(ABIs) {
+    for (let i = 0; i < ABIs[0].length; i++) {
+        if (exceptions.includes(ABIs[0][i].name)) {
+            ABIs[0].splice(i, 1);
+            i--;
+        }
+    }
+    for (let i = 0; i < ABIs[1].length; i++) {
+        if (exceptions.includes(ABIs[1][i].name)) {
+            ABIs[1].splice(i, 1);
+            i--;
+        }
+    }
+}
+
+checkISTR();
diff --git a/scripts/calculateSize.js b/scripts/calculateSize.js
index 3f3db87f9..88d1e1d4c 100644
--- a/scripts/calculateSize.js
+++ b/scripts/calculateSize.js
@@ -9,7 +9,7 @@ async function readFiles() {
         return fs.readdirSync("./build/contracts/");
     } else {
         console.log('Compiling contracts. This may take a while, please wait.');
-        exec('truffle compile');
+        exec('./node_modules/.bin/truffle compile');
         return fs.readdirSync("./build/contracts/");
     }
 }
diff --git a/scripts/clashCheck.js b/scripts/clashCheck.js
index 09f36d31c..6133d4c0b 100644
--- a/scripts/clashCheck.js
+++ b/scripts/clashCheck.js
@@ -8,7 +8,7 @@ async function readFiles() {
         return fs.readdirSync("./build/contracts/");
     } else {
         console.log(chalk.yellow('Compiling contracts. This may take a while, please wait.'));
-        exec('truffle compile');
+        exec('./node_modules/.bin/truffle compile');
         return fs.readdirSync("./build/contracts/");
     }
 }
@@ -47,9 +47,10 @@ async function checkClashes() {
     });
     if (clashesFound) {
         console.log(chalk.yellow("The clash(es) might be in two different contracts and hence not be am Issue.\nThis script can not detect this (yet) because of proxy contracts"));
-        throw("Clash(es) found! Please fix.");
-    }  
+        console.log(chalk.red("Clash(es) found! Please fix."));
+        process.exit(1);
+    }
     console.log(chalk.green("Clash check finished. No Clashes found."));
 }
 
-checkClashes();
\ No newline at end of file
+checkClashes();