CEng Application - How to write it?

I am unsure how to write the CEng Application, especially the part under career history. 

I have used the career manager self assessment and have drafted 4-5 examples against each competency using the STAR technique - I am happy with this, although need to tidy it up. 

Under career history, I have included all jobs I have done in the last 10 years, however, I am unsure how to write this.

Is it meant to be: 

  • An overview of my job and responsibilities
  • Around three examples of work and projects I have been involved with for my current and last job with one example for the earlier jobs. 

Or:

  • A bigger in-depth example which covers many competencies and goes into more depth explaining the 'nitty-gritty' details of what I did and why? 

I do plan on contacting a PRA, but would like to have something drafted out to discuss and refine before I approach them. 

Can someone please advise on the best way to approach this? 

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