In English, back-chaining retains phonological structure better than front-chaining. Normally there is no difference in stress between a word spoken in isolation and one spoken at the end of a sentence5 and it is arguably better to start with the final syllable (main stress in bold):
Chaining sequences for the English word 'aroma':
Syllables tend to follow a stressed-unstressed pattern in English, example: happy (though there are many exceptions). The order -ma, -roma and aroma respects this. Starting with a- and aro- entails reversing this pattern, which complicates learning. Teachers could choose to present a chain as pairs of syllables too, beginning with -roma, then aroma which introduces the strong-weak stress pattern from the outset.
"Backchaining." Glossary. Retrieved April 4, 2009, from http://www.usingenglish.com/glossary/backchaining.html http://www.usingenglish.com/glossary/backchaining.html ↩
"Backchaining." Teaching English. Retrieved April 4, 2009, from http://www.teachingenglish.org.uk/think/knowledge-wiki/backchaining Archived 2011-09-27 at the Wayback Machine http://www.teachingenglish.org.uk/think/knowledge-wiki/backchaining ↩
Wolfgang Butzkamm & J.A.W. Caldwell (2009). The bilingual reform. A paradigm shift in foreign language teaching. Tübingen: Narr Verlag, p.148. /wiki/Wolfgang_Butzkamm ↩
Compare psychological in isolation, it's psychological and psychological profile, where only in the last does the main stress shift to another syllable. ↩