Is it possible to sign a PDF file, make some changes, and add another signature?

For example, if you create a test plan, sign off on it, fill it in electronically, and need to sign the "filled in version" too? It would be good to be able to create a document that gets signed off, that then can be added to, and then the addition also signed. I'm not sure if I'm making myself clear. We could use the certify feature, maybe, but we need to have multiple people sign-off on a file the first time before it's used. Then we want someone to use the info/add comments/maybe complete a form (we haven't worked that out) and have them sign that they completed it.
Thank you.

Yes you can with restrictions. You need to create your original PDF in such a way that you may make certain changes after it is signed. The easiest way to do it is to certify the original PDF with certain permissions. Acrobat Pro UI provides certain combinations of such permissions. Adobe LiveCycle provides more granular combinations of permissions but this is an expensive solution. Try first what Acrobat Pro UI gives you and see if it gets you want you need. You may apply as many modifications and signatures to the document as long as they conform to the certification permissions. The last signer can also lock his signature which disallows further modifications and signing.

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