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Module 5: Conditional Logic & Branching

This module focuses on how to represent branching logic using the Conditional: block in Experience Notation. You’ll learn how to model decision points, alternate paths, and structured IF–THEN–ELSE expressions.

Learning Outcomes

By the end of this module, you will be able to:

  • Use the Conditional: block within steps
  • Distinguish between IF, THEN, and ELSE
  • Apply conditional logic to model both positive and negative paths
  • Keep logic clear and readable using consistent formatting

Basic Conditional Structure

Conditional:
  IF: user input is invalid
  THEN: display error message
  ELSE: proceed to next step

A Conditional: block must:

  • Be indented inside a Step:
  • Include at least IF: and THEN: lines
  • Optionally include ELSE:

Scenario 1: Form Validation

Model a form submission step with conditional feedback based on input.

Event: Submit Form
  Step: Enter email address
    User: Guest
    Action: Clicks submit button
    UI-Element: Signup Form
    Conditional:
      IF: email field is empty
      THEN: display validation error
      ELSE: show success message

Scenario 2: Payment Status

Represent a conditional flow for a payment process where the outcome depends on success.

Event: Process Payment
  Step: Submit card details
    User: Buyer
    Action: Clicks "Pay Now"
    UI-Element: Checkout Form
    Conditional:
      IF: payment fails
      THEN: display failure message
      ELSE: show confirmation screen

Best Practices

  • Keep conditions readable and domain-relevant
  • Avoid overly complex or deeply nested conditionals
  • Use THEN: and ELSE: outcomes that are clear and actionable

Next: Module 6: Final Assessment.