Suppose you are searching for trends in the Dutch clothing market in recent years, but you find information about the German second-hand clothing market via Google in an article from 2015.... Does this article then help answer your question?
It is quite difficult to determine whether an article is relevant or not.
Things to look out for:
- Is the sector similar to the one you are looking at (clothing market vs second-hand clothing market)?
- Is the region comparable to the region you are looking in (Netherlands vs Germany)?
- is the age of the article recent enough (now vs 2015)?
- is the information reliable enough to use? (databases vs Google)
'Similar' and 'recent' are of course subjective terms. In fact, it very much depends on the sector/region/age and your assignment (and teacher). If a market has changed a lot in recent years, you would prefer more recent information than, say, 2015. Especially if both the sector, region and age are not a good match for your assignment, then an article is probably not worthwhile. If you are in doubt about this, contact your tutor.