Originally Posted by article
Giftedness should be viewed as a developmental construct that is always the result of the dynamic influence of many factors–including general and specific abilities, motivation, personality, interest, opportunity, family input, education, and community resources

Clearly the author has confused the words "achievement" and "giftedness." With some judicious editing, he can make sense:

Originally Posted by corrected article
Achievement should be viewed as a developmental construct that is always the result of the dynamic influence of many factors, including: giftedness, motivation, personality, interest, opportunity, family input, education, and community resources

Much better.