What you should know about KSA Writing
A KSA should be written in the first person narrative. Your KSA writing should be clear, straight to the point as well as flawless in terms of grammar and spelling. It should sound from your own voice while being professional.
Once you've added the personal information and ksa number to your document, you should copy word for word the KSA point required in the announcement. After that you can start writing your KSA, showing how your knowledge, Skills and Abilities fit the job you're applying to.
While writing your KSA also make sure to not stuff it with too much information; do not forget anything that might be important as well.
In some cases, your KSA can be generic rather specific for things such as your ability to communicate orally, in writing, etc...
After writing your KSA responses, put them away for a while, from a few hours to a couple of days. Then read them carefully, making sure you haven't made any mistakes or forgotten anything.
Please note that, in some cases, you can earn extra points for your Federal resume if you provide a KSA even though the job posting does not mention that it's needed.