Functional test · E2E

ThinkAloud report

https://www.saucedemo.com/ · functional test (end-to-end)

4/4
completed the task
About this test — task, personas, method

Task: Log in with the demo account (username: standard_user · password: secret_sauce), add the Sauce Labs Backpack to the cart, complete checkout with any plausible name and postal code, and verify you reach the order confirmation. This is Sauce Labs' public demo shop, built for exactly this kind of testing — completing the purchase flow is safe and expected.

Personas: First-time buyer in a hurry · Careful buyer who double-checks

Models: Gemini-2.5 + Claude-Haiku (a finding confirmed by both counts more strongly)

Method: synthetic personas read the page in a real browser and thought aloud; an attention model predicted the first glance.

Field 1 — First glance

Where the eye lands

red = high predicted attention*

8% of the predicted first glance lands on an action · 92% on text/decoration. This page must trigger an action — so the share is worth tracking over time.

Does the eye land on the action — or on the decoration? Ranked by predicted attention:**

  • Login primary8%
Functional test — E2E

Did the personas make it?

Each test person tried to complete the task in a real browser. 4 of 4 made it.

Completed
Careful buyer who double-checks Gemini-2.512 steps
Completed
Careful buyer who double-checks Claude-Haiku12 steps
Completed
First-time buyer in a hurry Gemini-2.512 steps
Completed
First-time buyer in a hurry Claude-Haiku12 steps
Blockers & defects

Where it broke down

No blockers or defects noted.

Strengths

What worked

works · MeaningConfirmed by both models

Clear and Well-Organized Cart Page

2/2 personas

The cart page is clear, simple, and well-organized, displaying items, prices, and a prominent 'Checkout' button that guides the user effectively.

  • First-time buyer in a hurry Claude-Haiku /cart.html
    „Cart page is clear and simple — item is visible, price is shown, Checkout button is obvious and prominent (green color)."
  • Careful buyer who double-checks Gemini-2.5 /cart.html
    „The cart clearly shows the item added, and the 'Checkout' button is prominent, guiding the user to the next step."
  • 1 more quotes
    • Careful buyer who double-checks Claude-Haiku /cart.html
      „Cart page is clear and well-organized. The item is correctly displayed with description, quantity, and price. The Checkout button is prominently visible and easy to locate."
works · SafetyConfirmed by both models

Clear and Reassuring Order Confirmation

2/2 personas

The order confirmation page is clear and obvious, featuring success messages, icons, and dispatch confirmations that effectively reassure the user of a successful purchase.

  • First-time buyer in a hurry Gemini-2.5 /checkout-complete.html
    „The confirmation message 'Thank you for your order!' is very clear and immediately confirms the successful completion of the purchase."
  • First-time buyer in a hurry Claude-Haiku /checkout-complete.html
    „Clear, obvious order confirmation page with success icon, confirmation message, and order dispatch confirmation. The entire purchase flow worked smoothly from login through checkout to final confirmation."
  • 2 more quotes
    • Careful buyer who double-checks Gemini-2.5 /checkout-complete.html
      „The order confirmation page is clear and immediately tells the user that the order is complete."
    • Careful buyer who double-checks Claude-Haiku /checkout-complete.html
      „Order confirmation page reached with clear success message, green checkmark icon, and order dispatch confirmation text. The entire checkout flow worked smoothly from login through payment."
works · Meaning

Clear and Pre-filled Login Credentials

2/2 personas

The login page clearly displays credentials, often pre-filling them, which significantly simplifies the login process for users.

  • First-time buyer in a hurry Claude-Haiku
    „Credentials are clearly displayed on the login page itself — very helpful for a first-time user in a hurry"
  • First-time buyer in a hurry Claude-Haiku
    „Credentials are clearly displayed on the page, making it easy to see what to enter"
  • 4 more quotes
    • First-time buyer in a hurry Claude-Haiku
      „Credentials are pre-filled and ready; clear green Login button is prominent and easy to tap"
    • Careful buyer who double-checks Claude-Haiku
      „Credentials are clearly displayed on the page, making it easy to log in"
    • Careful buyer who double-checks Claude-Haiku
      „Login credentials are clearly displayed on the page for reference, making it easy to know what to enter"
    • Careful buyer who double-checks Claude-Haiku
      „Both credentials are already correctly filled in from previous steps, making the next action straightforward"
works · Capability

Smooth Login and Clear Product Display

2/2 personas

The login process is seamless, leading directly to a well-organized product catalog with clearly visible items, prices, and 'Add to cart' options.

  • First-time buyer in a hurry Claude-Haiku /inventory.html
    „Login worked smoothly, and I'm now viewing the product catalog. The Sauce Labs Backpack is immediately visible with a clear price and 'Add to cart' button."
  • Careful buyer who double-checks Claude-Haiku /inventory.html
    „Login was successful and products page loaded cleanly with clear product cards, prices, and add-to-cart buttons"
works · Capability

Clear Cart Item Confirmation

2/2 personas

Adding an item to the cart is clearly confirmed through visual cues like a 'Remove' button and an updated cart badge, reassuring the user.

  • First-time buyer in a hurry Claude-Haiku /inventory.html
    „Backpack is already added to cart (Remove button confirms it), cart badge shows 1 item"
  • Careful buyer who double-checks Claude-Haiku /inventory.html
    „Backpack successfully added to cart — confirmed by 'Remove' button and cart badge showing 1 item"
works · Meaning

Clear and Straightforward Checkout Form Layout

2/2 personas

The checkout form is clearly laid out, straightforward, and well-organized with visible fields, placeholders, and labels, making it easy to understand.

  • First-time buyer in a hurry Claude-Haiku /checkout-step-one.html
    „Form is clear and straightforward, fields are visible and easy to locate"
  • Careful buyer who double-checks Claude-Haiku /checkout-step-one.html
    „Clear, well-organized checkout form with obvious fields and action buttons"
  • 1 more quotes
    • Careful buyer who double-checks Claude-Haiku /checkout-step-one.html
      „Form layout is clear and straightforward with visible placeholders and proper field labels"
works · Effort

Pre-filled Checkout Form for Fast Completion

2/2 personas

The checkout form fields are largely pre-filled with valid data, significantly reducing user effort and enabling a very fast completion of the first checkout step.

  • First-time buyer in a hurry Claude-Haiku /checkout-step-one.html
    „Form is mostly pre-filled, only one field left to complete — very fast path to checkout"
  • First-time buyer in a hurry Claude-Haiku /checkout-step-one.html
    „All form fields are pre-filled with valid data, making it easy to proceed immediately"
  • 2 more quotes
    • Careful buyer who double-checks Claude-Haiku /checkout-step-one.html
      „Form fields are clearly laid out and previous entries (John, Smith) are retained, making the checkout flow smooth"
    • Careful buyer who double-checks Claude-Haiku /checkout-step-one.html
      „All required fields are pre-filled with valid, plausible data (name and postal code format correct). Form is ready to submit."
works · Meaning

Clear and Verifiable Checkout Overview

2/2 personas

The checkout overview provides all order details clearly, allowing users to easily verify information before final submission, with a prominent 'Finish' button.

  • First-time buyer in a hurry Claude-Haiku /checkout-step-two.html
    „Clear checkout overview with all order details visible, green Finish button is obvious and ready to click"
  • Careful buyer who double-checks Claude-Haiku /checkout-step-two.html
    „Clear checkout overview with all order details (item, quantity, price, tax, total, payment method, shipping) displayed correctly and easy to verify before final submission."

Isolated praise

Raw data

Full transcript

Everything the personas wrote, turn by turn — the summaries above are clustered out of exactly these words. Open a persona to read all of it.

First-time buyer in a hurry · Gemini-2.5 · 12 steps · done
First-time buyer in a hurry · Claude-Haiku · 12 steps · done
Careful buyer who double-checks · Gemini-2.5 · 12 steps · done
Careful buyer who double-checks · Claude-Haiku · 12 steps · done
Notes

* First glance (~3 sec): where the eye instinctively lands. Says nothing about comprehension — the think-aloud part measures that.

** There is no universal target for how much of the first glance should land on an action — compare with your own page before and after a change.