data: {
  progressions: {
    id: {
      contentRef,
      progression : {
        current,
        total
      }
      lives
    }
  },
  slides: {
    id: {
      moocModel
    }
  }
},
current: {
  progressionId
},
ui: {
  progressions:{
    id: {
      slides: {
        id: {
          answer: {

          }
        }
      }
    }
  }
}