Cause to Effect
Explanations based on progressions from cause to effect and the reverse are admirably suited to operations, movements, changes, conditions, elections. An exposition of a manufacturing process might move from cause to effect.
A legislator trying to secure the passage of a measure might explain its operation by beginning with the law (the cause) and tracing its results (the effect). So, too, a reformer might plead for a changed condition by following the same method. A speaker dealing with history or biography might use this same plan.