diff --git a/addons/api/addon/services/scope.js b/addons/api/addon/services/scope.js
new file mode 100644
index 000000000..e9088e40e
--- /dev/null
+++ b/addons/api/addon/services/scope.js
@@ -0,0 +1,111 @@
+import Service from '@ember/service';
+import { tracked } from '@glimmer/tracking';
+import { computed } from '@ember/object';
+
+/**
+ * This module includes two parts:
+ *
+ *   - `Scope` class:  a data structure representing an org/project tuple
+ *   - `ScopeService`:  manages the scope and exposes it to the application
+ */
+
+/**
+ * Represents a _scope_, which is defined as an organization/project tuple.
+ * This class is intended as a simple data structure and is used by the
+ * scope service (see below).
+ * Immutable.
+ */
+class Scope {
+  /**
+   * @type {?object}
+   * @private
+   */
+  #org = null;
+
+  /**
+   * @type {?object}
+   * @private
+   */
+  #project = null;
+
+  /**
+   * Initializes an instance of `Scope` with optional org and/or project.
+   * @param {?object} org
+   * @param {?object} project
+   */
+  constructor(org = null, project = null) {
+    if (org) this.#org = org;
+    if (project) this.#project = project;
+  }
+
+  /**
+   * Org for this scope.  Immutable.
+   * @type {?object}
+   */
+  get org() {
+    return this.#org;
+  }
+
+  /**
+   * Project for this scope.  If org is null, so is project.
+   * @type {?object}
+   */
+  get project() {
+    return this.org ? this.#project : null;
+  }
+
+  /**
+   * Returns the JSON serialization of this scope.
+   * @return {?object}
+   */
+  toJSON() {
+    const { org, project } = this;
+    return JSON.stringify({ org, project });
+  }
+}
+
+export { Scope };
+
+/**
+ * The scope service manages and persists the current scope.  Validating against
+ * available organizations and projects is outside the scope (tee hee) of this
+ * service because it is used by the adapter mixin to generate API paths, which
+ * could lead to problems were this service to attempt to fetch data.
+ *
+ * For now, should an invalid scope arise, it is left to the user to refresh,
+ * since they are likely to encounter 404s.  This is an acceptable tradeoff for
+ * an initial release because invalid scopes are considered uncommon.
+ */
+export default class ScopeService extends Service {
+  /**
+   * The currently selected scope.
+   * @type {?Scope}
+   */
+  @tracked scope = null;
+
+  /**
+   * When setting org, `service.org = {...}`, a new scope is instantiated,
+   * since scopes are immutable.
+   * @type {?object}
+   */
+  @computed('scope.org')
+  get org() {
+    return this.scope ? this.scope.org : null;
+  }
+  set org(org) {
+    this.scope = new Scope(org, this.project);
+  }
+
+  /**
+   * When setting project, `service.project = {...}`, a new scope is
+   * instantiated, since scopes are immutable.
+   * @type {?object}
+   */
+  @computed('scope.project')
+  get project() {
+    return this.scope ? this.scope.project : null;
+  }
+  set project(project) {
+    this.scope = new Scope(this.org, project);
+  }
+}
diff --git a/addons/api/app/services/scope.js b/addons/api/app/services/scope.js
new file mode 100644
index 000000000..6c4b4d6c8
--- /dev/null
+++ b/addons/api/app/services/scope.js
@@ -0,0 +1 @@
+export { default, Scope } from 'api/services/scope';
diff --git a/addons/api/tests/dummy/app/routes/application.js b/addons/api/tests/dummy/app/routes/application.js
new file mode 100644
index 000000000..62946d66d
--- /dev/null
+++ b/addons/api/tests/dummy/app/routes/application.js
@@ -0,0 +1,10 @@
+import Route from '@ember/routing/route';
+import { inject as service } from '@ember/service';
+
+export default class ApplicationRoute extends Route {
+  @service scope;
+
+  afterModel() {
+    //console.log(this.scope);
+  }
+}
diff --git a/addons/api/tests/dummy/app/templates/application.hbs b/addons/api/tests/dummy/app/templates/application.hbs
index 5230580f8..f8bc38e7b 100644
--- a/addons/api/tests/dummy/app/templates/application.hbs
+++ b/addons/api/tests/dummy/app/templates/application.hbs
@@ -1,3 +1,3 @@
 <h2 id="title">Welcome to Ember</h2>
 
-{{outlet}}
\ No newline at end of file
+{{outlet}}
diff --git a/addons/api/tests/dummy/app/templates/index.hbs b/addons/api/tests/dummy/app/templates/index.hbs
new file mode 100644
index 000000000..9015a7a32
--- /dev/null
+++ b/addons/api/tests/dummy/app/templates/index.hbs
@@ -0,0 +1 @@
+index
diff --git a/addons/api/tests/unit/services/scope-test.js b/addons/api/tests/unit/services/scope-test.js
new file mode 100644
index 000000000..a1844e3e4
--- /dev/null
+++ b/addons/api/tests/unit/services/scope-test.js
@@ -0,0 +1,67 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+import { Scope } from '../../../services/scope';
+
+module('Unit | Service | scope class', function (hooks) {
+  setupTest(hooks);
+
+  test('it provides a scope class', function (assert) {
+    assert.expect(1);
+    assert.ok(Scope);
+  });
+
+  test('it has initializable org and project members', function (assert) {
+    assert.expect(2);
+    const org = { id: 1 };
+    const project = { id: 2 };
+    const scope = new Scope(org, project);
+    assert.equal(scope.org.id, 1);
+    assert.equal(scope.project.id, 2);
+  });
+
+  test('it has a null project if org is null, even if project was initialized to non-null', function (assert) {
+    assert.expect(2);
+    const org = null;
+    const project = { id: 2 };
+    const scope = new Scope(org, project);
+    assert.notOk(scope.org);
+    assert.notOk(scope.project);
+  });
+
+  test('it serializes to JSON', function (assert) {
+    assert.expect(2);
+    let scope = new Scope({ id: 1 });
+    assert.deepEqual(JSON.parse(scope.toJSON()), {
+      org: { id: 1 },
+      project: null,
+    });
+    scope = new Scope({ id: 1 }, { id: 2 });
+    assert.deepEqual(JSON.parse(scope.toJSON()), {
+      org: { id: 1 },
+      project: { id: 2 },
+    });
+  });
+});
+
+module('Unit | Service | scope', function (hooks) {
+  setupTest(hooks);
+
+  test('it returns nulls when scope is not set', function (assert) {
+    assert.expect(3);
+    const service = this.owner.lookup('service:scope');
+    assert.equal(service.scope, null);
+    assert.equal(service.org, null);
+    assert.equal(service.project, null);
+  });
+
+  test('it aliases org and project to a scope instance', function (assert) {
+    assert.expect(2);
+    const service = this.owner.lookup('service:scope');
+    const org = { id: 1 };
+    const project = { id: 2 };
+    service.org = org;
+    service.project = project;
+    assert.equal(service.org, service.scope.org);
+    assert.equal(service.project, service.scope.project);
+  });
+});
diff --git a/addons/rose/app/controllers/index.js b/addons/rose/app/controllers/index.js
index d311e73a0..3b56b102a 100644
--- a/addons/rose/app/controllers/index.js
+++ b/addons/rose/app/controllers/index.js
@@ -3,8 +3,8 @@ import { action } from '@ember/object';
 
 export default class IndexController extends Controller {
   @action
-  selectChange(value) {
+  selectChange(/*value*/) {
     // eslint-disable-next-line no-console
-    console.log(value);
+    //console.log(value);
   }
 }