Dear Bindu,
I would like to explain in simple words.
Any capital project, the expenditure of which is debited to capital expenditure, is termed as "capital work in progress" right from day one of its start till it is fully accomlished for operation. The project once becomes fully operational becomes a completed work.
But, some corporate offices try to take advantage of depreciation during different financial years even during the curerency of work before its completion by declaring parts of projects as completed. In fact that is risky, if the Taxation authorities take cognizance of that. That is not correct unless a big project is segmented in to small projects to be completed and made operational in parts for the purpose of earning revenue.