Alist should be introduced with a colon when the list is preceded by

a strong opinion.
a complete thought.
a dependent clause.
a descriptive phrase.

A list should be introduced with a colon when the list is preceded by a complete thought.

Explanation: When using colons in a list, colons do not precede a list unless it follows a complete sentence. Here's an example:

In order to successfully use a colon in a list, one should do the following:

the author is intending to draw attention to the plight of refugees, editorial and biography support this. both workpieces make the reader empathize with enrique as well as with the other young migrants from central america. the writer, however, is using a different approach to each text.

the editorial includes strong words to persuade readers. he is trying hard to convince readers in the us to change its refugee approach.

the biography relies on narrative techniques and figurative language which the writer uses wisely in the setting, characterization, and personification to educate readers on the topic.

oral reading is important because then you may end up loving to read if you hate it now. i hope i .