The thing to remember is that contract conditions often reflect the uncertainties of life when they hired you i.e. is this guy going to be any good or not?
If you work for them for any period of time, then unless they had a review point or a good HR department, the chances are no-one ever did this treview, except so far as salary and any general changes that affect all employees, and they do not reflect your current working and professional relationship.
This means that when you come to leave, unless there are exceptional reasons for wanting to stick to the exact legal constraints of the contract, you need to reflect on your current position and value to them.
In that regard, what you suggest seems very reasonable; just have your proposal ready for when you actually resign and be prepared to be reasonable. This will put you in the strongest position. Unless, of course, your bosses are morons or likely to through temper tantrums, which you don't indicate.
As the others say, planning is about making sure that the stuff you need to take with you is already in your control... don't wait for when security dump you and a cardboard box out in the rain.
Incidentally, I'm not sure what you mean by "WRT the vacation thing, that would be very slimy, indeed."
If you've earned vacation i.e. so many days entitlement for so many days worked, then that is yours. If you leave wit two weeks holiday due, then that is your time and they need to pay you for it. This could mean you working two weeks notice and collecting 4 weeks pay. If you mean, give two weeks notice and then take it as holiday, I agree with you.
Lastly, and it comes up very often in these threads, remember that all contracts are negotiable.
What the employer offers is his standard terms and conditions. Unless you think about the terms, they won't.
If you don't like it, negotiate. The times to negotiate are:
[ul square][li]when first employed[/li]
[li]when your job changes[/li]
[li]when seniority changes[/li][/ul]
Trying to re-negotiate notie periods at anyother time will cause management suspicions and may result in them assuming you are about to leave and taking pre-emptive action.
JMW
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