[fyz]

Productivity in this case is fairly simple to calculate = Cost/Duration.

You can factor in the time (presumably that’s paid for so you should have a real number) and cost of materials (On-site use historical or replacement cost) yourself.

Your points holds more generally though, especially when there aren’t clear prices paid.

[tonyedgecombe]

That isn't productivity, productivity is value/duration.

[alephu5]

You're absolutely right, but in "Agile" teams this is exactly how they measure productivity: story points (cost)/sprint (duration)

[etripe]

And that is exactly why management shouldn't be looking at or comparing burndown charts. It's too tempting to see IT as a cost centre instead of an enabler.

[zhte415]

Define value. Now that's a rabbit hole. Marxist definition? Ricardian?