"For" and "because" are common connecting words which indicate a Ground relationship. However, sometimes we find these words presenting a further explanation of what preceded, not a logical basis.

The easiest way of determining which relationship is more appropriate for a given text is to ask whether the author/speaker is restating what was said before with further explanation (Idea-Explanation) or making a distinct statement which supports what preceded (Ground).

When the supporting statement precedes, it is an Inference relationship. When the supporting statment follows, it is a Ground relationship.

Thus, in both cases the label will always be in the second of the two arcs.

Use Bilateral when you have three propositions that you want to relate, the grounding one sandwiched between two inferences. Conversely, Gound and Inference will only relate two propositions (or groups of propositions).

Both Ground and Action-Purpose answer the question "Why?". The difference is that with Ground, the supported action or reality looks back (chronologically or logically) to the truth of the grounding idea. Conversely, with Action-Purpose, the action looks forward with the intention to bring about the purposed result.