Dear Nourhan, 

Check with the authors to these papers:

Article Limitations of subjective cognitive load measures in simulat...

Chapter 18 Cognitive load theory: researching and planning teaching ...

Article Measuring cognitive load: mixed results from a handover simu...

Article Learning Anatomy via Mobile Augmented Reality: Effects on Ac...

Hi Nourhan,

The Paas scale is by far the most used measure in the last 20 years or so. The google books link below has an example of what it looks like on p. 16. This scale is usually administered after every test question you'd like to measure, or after every question or example during the learning phase of your experiment.

A few years ago, a different scale was developed by Leppink that actually measures all types of cognitive load separately and is administered at the end of the learning phase. It was tested on PhD students, so bear that in mind. I saw him speak earlier in the summer and the conversation was being had around germane load - can you actually measure germane load? The consensus was that when measuring germane load using this instrument, that it might be more appropriate to say we're measuring a Subjective Judgement of Learning, that is, how the learner thinks they've improved based on their learning experience. 

https://books.google.com.au/books?id=66sJmAycE3cC&lpg=PA16&dq=very%20very%20low%20mental%20effort&pg=PP1#v=onepage&q&f=false

Article Development of an instrument for measuring different types o...

May I know if I want to measure cognitive load, which 1 is better to be used?

Paas Scale or Leppink scale?

I am trying so hard to locate Paas cognitive load scale and all the articles only briefly mentioned ...on 9 likert scale. Anyone can help to find the copy of the scale? Many thanks! How many items this scale consisted of? What are specific items? 

 Dear Rumei,  See the attachment..

Chapter Assessment of Cognitive LoAd in muLtimediA LeArning theory, ...