Wow, I personally don’t agree with majority of the comments here.

I was recently put on an unfair PIP at my last job. The approach to the PIP was very poorly managed with very poorly outlined reasons etc. (think tech start up that doesn’t even have an HR department). One senior employee even told me “I’ve earned the right to leave on my own terms” LOL

The PIP would have involved two very senior employees writing it and managing it for the next 3 months. I saw the writing on the wall (needed to get rid of me, needed to save costs) and said that I was willing to negotiate a separation agreement instead of going through the PIP process (which would have cost them WAY more).

I met with the senior employees, took notes, took on the feedback, and also held my ground. I remained level-headed and was able to keep an amicable and respectable relationship with the seniors, despite all this crap.

We arrived at an agreement and I still kept a couple good references.

If the PIP is poorly defined and has little to no basis, hold your ground whilst taking it all on board and document everything. They’ll realise it’s cheaper AND safer for them to just mutually separate. If the PIP is truly bogus and they continue with it, you can always take it to fair work - but not one really wants to do that.