Procedures for depreciation

first, depreciation falls in which category: Events/transactions, Account balances or Presentation/disclosure?

Second, one procedure for depreciation is listed is as below:

“Inspect the capital expenditure budget for the next few years to assess the appropriateness of the useful lives in light of plans to replace assets”

this wd fall in which category? Valuation, allocation or accuracy?

(the text says for depreciation, valuation, allocation and accuracy need to be verified.)

thanks in advance!!