There maybe a need for capital, for technical equipment, for manpower, for expertise, etc. That more resources are needed may be due to poor planning or unexpected circumstances. It may also be that another call on resources has emerged. Code 17/5 can always be used as a handy excuse when things are not on schedule. As with several other codes there is always the danger of misuse but this is no worse than the misuse of language. It is even more obvious and blatant