Define a qualifying asset
A qualifying asset is one that takes a substantial period of time to get ready for its intended use or sale.
Under IAS 16 the cost of PPE is the
Purchase price plus any directly attributable costs to bring the asset to its present location and condition for intended use
3 criteria for provisions
A present obligation as a result of the past event
Probable outflow of economic benefit
Reliable estimate 
the principle of recognizing expenses immediately (i.e., not overstating assets) and not recognizing income until it is reasonably certain (i.e., deferring revenue recognition).
Prudence