I admit to asking Stephen to post this question specifically to DHAnswers after I answered his private e-mail. I figured the discussion would be of use to a wide range of folks; yes it is, as noted on Twitter (I think), a question about grant-writing. But it's also a question about technology, to some extent, and also a question about interacting with people who hear and use terms without a full understanding of what they mean.
So, as to the term "future-proof," it does have meaning and it is a legitimate question that could be asked by stakeholders in several areas (e.g. a funder or a librarian could be asking the question and your answer could be different but equally meaningful to both). Can you actually future-proof something? No, not really, but there are absolutely steps that can be taken at project outset and also as time moves on to ensure that the project does not die on the vine (and take the rest of the vine with it).
When Stephen asked "how people "future-proof" online or digital projects? What does it even mean?" I answered him thusly:
I'd say what it means depends on who is asking. If it's a funding agency looking for some assurances that their investment will be used to make something sustainable, they are likely talking about the technical details rather than the content. For example, they would want to make sure that the content is in a format easily transferred to something else or easily put into a different framework. This is why you see a lot of curated projects taking advantage of open source or otherwise non-proprietary software/languages/databases -- so that the content and its presentation is independent of the structures housing it (for example: documents encoded in TEI or another SGML
derivative rather than existing solely as Microsoft Word documents).
When he asked "Does it signal proofing the project against becoming technically obsolete, or obsolete in terms of the content it has, etc?" I said:
Typically it's the technology; I would say in DH projects there's at least a tacit understanding that the work being undertaken is itself work that should lead to knowledge creation (and thus the addition of more content). DH projects-as-scholarship are as future-proofed as their paper counterparts, you know?
And, to "what am I supposed to say to someone who asks me to show that my proposed project has been "future-proofed"?" I said:
I would say that if you show an attention to using current standards-compliant, open source, cross-platform methods for storing, displaying, and otherwise maintaining the content, it's as future-proofed as anything is going to be. There's future-proofed, as
in "will I be able to read this 10 years from now" and then there's "is this built in the most sustainable or manageable way," which are a bit different. For example, if your data is stored in a bunch of static marked-up XML files, technically it's future-proofed, but is it the most efficient or easily managed/moved/stored/displayed? perhaps
not.
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So, that's what I said. I also like Dorothea's and Hugh's answers. They're shorter.