Building Item Branching Assessments – Learnosity Product & Developer Help

This article covers initialization options specific to Item Branching activities. They are a lightweight form of dynamic assessment, with conditional branches pre-configured in the activity definition. For more precise adaptive algorithms relying on questions with calibrated difficulty see the Item and Testlet Adaptive assessments. You can also refer to the knowledge base article about Adaptive and Dynamic Assessments.

Note: when designing the tree for Item branching, you cannot use Items more than once, i.e. Items cannot be re-used.

{
    "adaptive": {

type

description	Type of adaptive behavior. In `itembranching`, the next item is selected based on responses to previous items, according to a pre-configured path provided in this configuration.
type	string
options	`itembranching`

    "type": "itembranching",

steps

description	An item branching assessment comprises an array of steps. Steps can define the reference of items to present to the student when visited, or decisions to select which branch to visit next. Only item steps result in items being presented to the student, decision steps are executed in the backend until the next item step is visited.
type	array of step objects: Item, with an optional decision based on the student's answer Global score decision The assessment starts at the first step defined in the array, which should be an item step. The order of the rest of the array does not matter.

    "steps": [

Item step

description	The most basic step provides an item reference to be presented to the student when visited, as well as an unconditional pointer to the next step.
type	object
properties	id: the identifier of this step to reference from other steps reference: the reference of the item to present to the user next: either `null` (end of the assessment), the `id` of the next step, or an object (see below)

      {
        "id": "step-1",
        "reference": "item-reference-1",
        "next": "step-2"
      },

Item step with binary decision

description	As before, a basic step providing an item reference, along with a conditional decision based on whether the student answered correctly or not.
type	object
properties	(As above, except the following) next: simple object with `correct`/`incorrect` attributes. correct: either `null` (end of the assessment) or the `id` of the next step incorrect: either `null` (end of the assessment) or the `id` of the next step

      {
        "id": "step-2",
        "reference": "item-reference-2",
        "next": {
            "correct": "global-decision-step-1",
            "incorrect": "step-3"
        }
      },

Global score decision step

description	Specify a binary decision, depending on whether the total score is at least some ratio of the maximum achievable so far, or not.
type	object
properties	id: the identifier of this step to reference from other steps type: must be `global-score` percentage: an integer between 0 and 100 representing the cut-off ration of the maximum score >=: either `null` (end of the assessment) or the `id` of the next step <: either `null` (end of the assessment) or the `id` of the next step

      {
        "id": "global-decision-step-1",
        "type": "global-score",
        "percentage": 50,
        ">=": null,
        "<": "step-4"
      },

Rest of the configuration

Finally, for the configuration to be valid, all steps referenced in others steps must be defined.

      {
        "id": "step-3",
        "reference": "item-reference-3",
        "next": "global-decision-step-1"
      },
      {
        "id": "step-4",
        "reference": "item-reference-4",
        "next": null
      }
    ]
}