diff --git a/pkg_client/package.json b/pkg_client/package.json
index bd4b27d..c08d18d 100644
--- a/pkg_client/package.json
+++ b/pkg_client/package.json
@@ -15,6 +15,8 @@
     "react": "^18.2.0",
     "react-bootstrap": "^2.9.1",
     "react-dom": "^18.2.0",
+    "react-icons": "^4.12.0",
+    "react-router-dom": "^6.21.0",
     "react-scripts": "5.0.1",
     "typescript": "^4.9.5",
     "web-vitals": "^2.1.4"
diff --git a/pkg_client/src/App.css b/pkg_client/src/App.css
index 74b5e05..2d26ac5 100644
--- a/pkg_client/src/App.css
+++ b/pkg_client/src/App.css
@@ -1,7 +1,3 @@
-.App {
-  text-align: center;
-}
-
 .App-logo {
   height: 40vmin;
   pointer-events: none;
diff --git a/pkg_client/src/App.tsx b/pkg_client/src/App.tsx
index baae969..405122f 100644
--- a/pkg_client/src/App.tsx
+++ b/pkg_client/src/App.tsx
@@ -2,7 +2,7 @@ import React, { useContext } from "react";
 import "./App.css";
 import APIHandler from "./components/APIHandler";
 import LoginForm from "./components/LoginForm";
-import Container from 'react-bootstrap/Container'
+import Container from "react-bootstrap/Container";
 import { UserContext } from "./contexts/UserContext";
 
 function App() {
@@ -13,9 +13,7 @@ function App() {
   return (
     <Container className="p-3">
       <Container className="p-3 mb-4 bg-light rounded-3">
-        <div className="App">
-          {content}
-        </div>
+        <div className="App">{content}</div>
       </Container>
     </Container>
   );
diff --git a/pkg_client/src/components/APIHandler.tsx b/pkg_client/src/components/APIHandler.tsx
index 4f2f070..6d46369 100644
--- a/pkg_client/src/components/APIHandler.tsx
+++ b/pkg_client/src/components/APIHandler.tsx
@@ -1,50 +1,39 @@
-import React, { useContext, useEffect, useState } from "react";
-import axios from "axios";
+import React, { useContext } from "react";
 import { UserContext } from "../contexts/UserContext";
 import Container from "react-bootstrap/Container";
+import { BrowserRouter, Routes, Route } from "react-router-dom";
+import Layout from "./Layout";
+import NLtoPKG from "./NLtoPKG";
 
 const APIHandler: React.FC = () => {
   const { user } = useContext(UserContext);
-  // State tracker for service management data.
-  const [serviceData, setServiceData] = useState(null);
-  // State tracker for personal facts data.
-  const [factsData, setFactsData] = useState(null);
-  // State tracker for PKG exploration data. Data presentation, graphs, etc.
-  const [exploreData, setExploreData] = useState(null);
-
-  useEffect(() => {
-    const baseURL =
-      (window as any)["PKG_API_BASE_URL"] || "http://localhost:5000";
-
-    axios
-      .get(`${baseURL}/service`)
-      .then((response) => setServiceData(response.data));
-    axios
-      .get(`${baseURL}/facts`)
-      .then((response) => setFactsData(response.data));
-    axios
-      .get(`${baseURL}/explore`)
-      .then((response) => setExploreData(response.data));
-  }, []);
 
   return (
     <Container>
-      <h1>Personal Knowledge Graph API</h1>
-      <div>
-        <p>Welcome {JSON.stringify(user, null, 2)}</p>
-      </div>
-      <div>
-        <h2>Service Management Data</h2>
-        <pre>{JSON.stringify(serviceData, null, 2)}</pre>
-      </div>
-      <div>
-        <h2>Personal Facts Data</h2>
-        <pre>{JSON.stringify(factsData, null, 2)}</pre>
-      </div>
-      <div>
-        <h2>PKG Exploration Data</h2>
-        <pre>{JSON.stringify(exploreData, null, 2)}</pre>
-      </div>
+      <h1>Personal Knowledge Graph</h1>
+
+      <BrowserRouter>
+        <Routes>
+          <Route path="/" element={<Layout />}>
+            <Route
+              index
+              element={
+                <div>
+                  <div>Welcome {user?.username}.</div>
+                  <NLtoPKG />
+                </div>
+              }
+            />
+            <Route path="service" element={<div>Service Management</div>} />
+            <Route path="population" element={<div>Population form</div>} />
+            <Route
+              path="preferences"
+              element={<div>Personal Preferences</div>}
+            />
+            <Route path="explore" element={<div>PKG Exploration</div>} />
+          </Route>
+        </Routes>
+      </BrowserRouter>
     </Container>
   );
 };
diff --git a/pkg_client/src/components/Layout.tsx b/pkg_client/src/components/Layout.tsx
new file mode 100644
index 0000000..1f0ccb5
--- /dev/null
+++ b/pkg_client/src/components/Layout.tsx
@@ -0,0 +1,47 @@
+// Layout component for the application includes a navigation bar and content
+// of the current tab.
+import { Outlet, Link } from "react-router-dom";
+import Nav from "react-bootstrap/Nav";
+import { useState } from "react";
+
+const Layout = () => {
+  const [activeKey, setActiveKey] = useState("/");
+
+  const handleSelect = (eventKey: string | null) => {
+    if (eventKey !== null) {
+      setActiveKey(eventKey);
+    }
+  };
+
+  return (
+    <>
+      <Nav variant="underline" activeKey={activeKey} onSelect={handleSelect}>
+        <Nav.Item>
+          <Nav.Link eventKey="/" as={Link} to="/">
+            Home
+          </Nav.Link>
+        </Nav.Item>
+        <Nav.Item>
+          <Nav.Link eventKey="/service" as={Link} to="/service">
+            Service Management
+          </Nav.Link>
+        </Nav.Item>
+        <Nav.Item>
+          <Nav.Link eventKey="/population" as={Link} to="/population">
+            Populate PKG
+          </Nav.Link>
+        </Nav.Item>
+        <Nav.Item>
+          <Nav.Link eventKey="/explore" as={Link} to="/explore">
+            Explore PKG
+          </Nav.Link>
+        </Nav.Item>
+      </Nav>
+
+      <br />
+      <Outlet />
+    </>
+  );
+};
+
+export default Layout;
diff --git a/pkg_client/src/components/NLtoPKG.tsx b/pkg_client/src/components/NLtoPKG.tsx
new file mode 100644
index 0000000..b6db7b6
--- /dev/null
+++ b/pkg_client/src/components/NLtoPKG.tsx
@@ -0,0 +1,44 @@
+// Natural language to PKG component
+
+import { Container } from "react-bootstrap";
+import { UserContext } from "../contexts/UserContext";
+import { useContext, useState } from "react";
+import axios from "axios";
+import QueryForm from "./QueryForm";
+
+const NLtoPKG = () => {
+  const { user } = useContext(UserContext);
+  const [error, setError] = useState("");
+  const baseURL =
+    (window as any)["PKG_API_BASE_URL"] || "http://127.0.0.1:5000";
+
+  const handleSubmit = (query: string) => {
+    return axios
+      .post(`${baseURL}/nl`, {
+        query: query,
+        username: user?.username,
+        user_uri: user?.uri,
+      })
+      .then((response) => {
+        // TODO: Handle response.
+        // Output can be displayed in information-container.
+        setError("");
+      })
+      .catch((error) => {
+        setError(error.message);
+        throw error;
+      });
+  };
+
+  return (
+    <Container>
+      <div>
+        <b>Manage your PKG with natural language queries.</b>
+      </div>
+      <QueryForm handleSubmit={handleSubmit} error={error} />
+      <Container id="information-container"></Container>
+    </Container>
+  );
+};
+
+export default NLtoPKG;
diff --git a/pkg_client/src/components/QueryForm.tsx b/pkg_client/src/components/QueryForm.tsx
new file mode 100644
index 0000000..ba4cb7a
--- /dev/null
+++ b/pkg_client/src/components/QueryForm.tsx
@@ -0,0 +1,66 @@
+// Form comprising a single text input and a submit button.
+
+import { useState } from "react";
+import { Alert, Button, Spinner } from "react-bootstrap";
+import Form from "react-bootstrap/Form";
+
+interface QueryFormProps {
+  handleSubmit: (query: string) => Promise<void>;
+  error: string;
+}
+
+const QueryForm: React.FC<QueryFormProps> = ({ handleSubmit, error = "" }) => {
+  const [query, setQuery] = useState("");
+  const [isSubmitting, setIsSubmitting] = useState(false);
+
+  const handleClick = async (query: string) => {
+    try {
+      setIsSubmitting(true);
+      await handleSubmit(query);
+      setQuery("");
+    } catch (error) {
+    } finally {
+      setIsSubmitting(false);
+    }
+  };
+
+  return (
+    <div>
+      {error && <Alert variant="danger">{error}</Alert>}
+      <Form>
+        <fieldset disabled={isSubmitting}>
+          <Form.Control
+            required
+            id="query-input"
+            type="text"
+            placeholder="Enter query"
+            value={query}
+            onChange={(e) => setQuery(e.target.value)}
+          />
+          <Button
+            id="submit-button"
+            variant="primary"
+            type="button"
+            onClick={() => handleClick(query)}
+            style={{ marginTop: "10px" }}
+            disabled={query === ""}
+          >
+            {isSubmitting ? (
+              <Spinner
+                as="span"
+                animation="border"
+                size="sm"
+                role="status"
+                aria-hidden="true"
+                style={{ marginRight: "5px" }}
+              />
+            ) : null}
+            {isSubmitting ? "Submitting..." : "Submit"}
+          </Button>
+        </fieldset>
+      </Form>
+    </div>
+  );
+};
+
+export default QueryForm;
diff --git a/pkg_client/src/contexts/UserContext.tsx b/pkg_client/src/contexts/UserContext.tsx
index 0e00073..5684d10 100644
--- a/pkg_client/src/contexts/UserContext.tsx
+++ b/pkg_client/src/contexts/UserContext.tsx
@@ -1,22 +1,29 @@
 import React, { useState } from "react";
 
 export type User = {
-    username: string;
-    uri: string;
-}
+  username: string;
+  uri: string;
+};
 
 type UserProviderProps = {
-    children: React.ReactNode;
+  children: React.ReactNode;
 };
 
-export const UserContext = React.createContext<{ user: User | null; setUser: React.Dispatch<React.SetStateAction<User | null>>; }>({ user: null, setUser: () => { } });
+export const UserContext = React.createContext<{
+  user: User | null;
+  setUser: React.Dispatch<React.SetStateAction<User | null>>;
+}>({ user: null, setUser: () => {} });
 
-export const UserProvider: React.FC<UserProviderProps> = ({ children, }: { children: React.ReactNode }) => {
-    const [user, setUser] = useState<User | null>(null);
+export const UserProvider: React.FC<UserProviderProps> = ({
+  children,
+}: {
+  children: React.ReactNode;
+}) => {
+  const [user, setUser] = useState<User | null>(null);
 
-    return (
-        <UserContext.Provider value={{ user, setUser }}>
-            {children}
-        </UserContext.Provider>
-    );
-}
\ No newline at end of file
+  return (
+    <UserContext.Provider value={{ user, setUser }}>
+      {children}
+    </UserContext.Provider>
+  );
+};