I would list the requirements and elements in the job description.
If you have a CV, refer to that. If no, compile a list of your previous jobs (paid or voluntary), your interests and think on anything else you've done.
A pal of mines was going for a new job and planning was a required competency. She was doing up her house and gave the example of planning the various steps needed to do up her kitchen.
Have a look at each requirement and then look at your previous employment or experiences for where you can demonstrate it.
Always focus on what YOU did and the outcomes. Don't use technical terms or abbreviations (unless you know they will be understood by the employer or different department) without saying what they are.
Don't go into too much detail, save that for the interview.
Don't use long sentences and don't waffle. Keep an eye on the character count. If you go over, edit using alternative, shorter words if needed.
Check the grammar and spelling. If someone else can have a read of it, that helps.
It would be an idea to think on any other examples you have as you might be asked that in an interview.
Anyway, good luck!