•Example: word 1 AND word2 OR word3
could be interpreted in 2
ways:
–((word1 AND word2) OR word3)
–(word1 AND (word2 OR word3))
•This makes a big difference when word1 does not retrieve any articles and word3 retrieves many.
–The 1st would show many while the 2nd would show none.
Determining Order of Operations