Components

components.x-coordinator.a.template.hbs

x-coordinator/a model={{coordinator.model}}

components.x-coordinator.b.template.hbs

x-coordinator/b model={{coordinator.model}}

components.x-coordinator.c.template.hbs

x-coordinator/c model={{coordinator.model}}

components.x-coordinator.template.hbs

{{yield (hash
  a=(component "x-coordinator/a" coordinator=this)
  b=(component "x-coordinator/b" coordinator=this)
  c=(component "x-coordinator/c" coordinator=this))}}  

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

{{#x-coordinator model="foo" as |coordinator|}}
  {{coordinator.a}}
  <hr>
  {{coordinator.b}}
  <hr>
  {{coordinator.c}}
{{/x-coordinator}}

twiddle.json

{
  "version": "0.10.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.1",
    "ember-template-compiler": "2.6.0"
  },
  "addons": {}
}