The Adobe Paragraph Composer

Considers a network of breakpoints for an entire paragraph, and thus can optimize earlier lines in the paragraph in order to eliminate especially unattractive breaks later on. Paragraph composition results in more even spacing with fewer hyphens.

The Paragraph Composer approaches composition by identifying possible breakpoints, evaluating them, and assigning a weighted penalty to them based on such principles as evenness of letterspacing, word spacing, and hyphenation.

You can use the Hyphenation dialog box to determine the relationship between better spacing and fewer hyphens. (See Hyphenate text.)

The Adobe Single-line Composer

Offers a traditional approach to composing text one line at a time. This option is useful if you want to restrict composition changes from late stage edits.