When students begin to add harmony notes to their melody Harmony Rule 1 does a nice job of providing context for consonance and dissonance as it relates to Steps and Skips.
The question inevitably arises however on how Leaps should be treated.
Every Leap can be viewed as a step or skip by simply changing the inversion. All except for Leaps that = 2-Skips. For example:
In the first interval the C is a skip plus 1 step above the G. In the second interval the C is moved below the G making this interval 2-skips.
While 2-Skips do not sound so much like a clash they are not as consonant as a Skip. We will treat 2-Skips as dissonances. Apply the same rules to 2-Skips as you would to Steps:
Resolve a 2-Skip interval to a Skip interval on the very next note.
Do not have two 2-Skip intervals in a row.
Do not leap to a 2-Skip interval.
With my students I color 2-skip intervals Green and ask them to try moving one of the notes up or down a Step making the open 5th into a 6th.
If you have come across this topic note that it relates to the Harmony Module on the Music Works 1 collection here. Check it out for more info!