What major problems can you foresee in applying capital budgeting techniques to investments made by public sector

Question:

What major problems can you foresee in applying techniques to investments made by public sector and not-for-profit enterprises or organizations?

Capital Budgeting
Capital budgeting is a practice or method of analyzing investment decisions in capital expenditure, which is incurred at a point of time but benefits are yielded in future usually after one year or more, and incurred to obtain or improve the...