Back-chaining is a technique used in teaching oral language skills, especially with polysyllabic or difficult words and phrases.
[1] It is easier than the front-chaining, which starts from the first syllable, because back-chaining requires that the student put the new element first where it is more difficult to forget.
Here is an example taken from Butzkamm & Caldwell:[3] 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 sentence[4] 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).
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.