Cognitive Walkthrough is an evaluation method, more precisely a Usability Inspection, in which no user participates.
This method focuses on the learnability of an application and what actions a new user would take for a given task and document it.
Therefore a usability expert emphasizes with a potential user and carry-out the given tasks.
For the procedure you need:

• a description of the prototype of the interface
• a task description
• a list of the actions a user need to complete the task
• an idea of who the users will be and what experience they have

Also an Evaluator should have these 4 questions in mind:

• Will user know what sub-goal they want to achieve?
• Will user find the action in the interface?
• Will user recognize that it accomplishes the sub-goal?
• Will user understand the feedback of the action?

Quellen :
Video: Müller-Birn, C., Lecture 9-2, LU #8 – Evaluating Techniques I – Human-Computer Interaction I (fu-berlin.de), Start: 1:40 End: 8:26, retrieved 10.06.2021, 13:00
Slides: 09-2_HCI_Cognitive_Walkthrough (fu-berlin.de), p.3-5