IRIS 42: Information and Research Instruction Suite for two-year colleges

the t in aspect stands for timeliness

Hmmm, I wonder if a 1957 book on education would have anything about charter schools? When was it written?

Look for the date the item was published, then apply some common sense.

Is the date appropriate for your topic? The answer to that question will depend on your topic.

For example, information in the sciences changes frequently, so research in scientific topics demands up-to-date information.

If your topic is in the social sciences or humanities, it might not be as important to have the most current information, and older materials may be extremely useful.

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