1.   One useful function of hypotheses is that they help to indicate what data are needed for their testing.

2.   The use of categories, when those categories serve a useful function, is not questioned.

3.   This so-called parasitic genetic material turns out to serve a useful evolutionary function.

4.   To be fair, these materials performed a useful function for a time in the propellers of Spitfires and similar aircraft.

5.   While it survived, it served a useful function in obtaining agreement on some economic questions such as currency convertibility and capital transfers.

6.   Working-class political parties also came to serve a useful integrative function for monopoly capital.

7.   Yet it does perform a number of useful functions.

8.   These combine time recording with an agenda, diary, alarm system, calculator and other useful functions.

9.   Another useful function allows people to track the status of planning cases as they wind through the approval process.

10.   Apart from the kernels of knowledge, this may in fact be the most useful function of financial message boards.