Next the measurer must think of some way that this theoretical construct could be manifested in a real-world situation. At first this will be not much more than a hunch, a context that one believes the construct must be involved in—indeed that the construct must play some determining role in that situation. Later this hunch will become more crystallized and will settle into a certain pattern. The relationship between the items and the construct is not necessarily one way as it has just been described. Often the items will be thought of first and the construct will be elucidated only later—this is simply an example of how complex a creative act such as instrument construction can be. The important thing is that the construct and items should be distinguished, and that eventually the items are seen as realizations of the construct.