Consider a situation of a telephone systems currently applied in software house for forwarding calls on an office-based telephone system, from the perspective of a first time user.

1. Users: New manager, developer, designer, testers and visitors. For this evaluation assume that the user is a new designer having a first day at the office.
2. Task: Cancel current forwarding and forward calls instead to a colleague with the extension 456.
3. Interface: Standard-size, touch-tone phone on desk. Overlay template includes the following information:

FWD *2

CNCL #2

SEND ALL

4. Correct Action Sequence: The seven correct actions for accomplishing this task are:
   1. Pick up the receiver.

Phone: dial tone

2. Press #2. {command to cancel forwarding}

Phone: bip bip bip

3. Hang up the receiver.
4. Pick up the receiver.

Phone: dial tone

5. Press *2. {command to forward calls}

Phone: dial tone

6. Press 1234.

Phone: bip bip bip

7. Hang up the receiver.

Perform a cognitive walkthrough using the above given information and identify the problems that can affect the performance of a system for a novice user.