It won't be unlisted criteria, that's the point. The behaviours and technical skills they are marking against will be listed in the advert.
Just lifted this from a random job advert:
Behaviours
We'll assess you against these behaviours during the selection process:
- Changing and Improving
- Delivering at Pace
- Communicating and Influencing
- Leadership
- Working Together
We only ask for evidence of these behaviours on your application form:
- Changing and Improving
- Delivering at Pace
There's then a link to this:
https://www.gov.uk/government/publications/success-profiles
And then more info on the CV and statement:
As part of the application process you will be asked to complete a CV, Suitability Statement (Max 500 Word Limit) and a number of behaviour examples. Further details around what this will entail are listed on the application form.
The Statement of Suitability should explain your motivation for applying to this role and offer evidence how you meet the essential criteria listed on the Job Specification.
The sift will be based on the Behaviours and the Suitability Statement.
The CV is for information purposes only and will not be marked.
In the event a high volume of applications are received, an initial sift will be based on the Lead Behaviour - Changing and Improving. Candidates who pass the initial sift will be progressed to a full sift.
Candidates shortlisted will be invited to an interview which will be Behaviour based questions
From this you know which behaviours are being scored in your statement (Changing & Improving and Delivering at Pace) with C&I being the most important as if they need to cut down the shortlist to a reasonable number they'll go from that score. There's also a link to read about the behaviours given, and on the actual form it says what info to not include to ensure it meets the blind recruitment principles. Can also see that the CV isn't marked, and what to include in the statement.
The info on how it will be marked and what will be considered in the sift is very clear. Admittedly how to formulate the statement etc can be confusing but plenty of other resources and videos online that explain this.
Best thing when applying is to print the job description, make a note of the behaviours being marked on the application (and print the framework if not familiar with them) and make sure your answer relates to the behaviour but also to the JD.