Here are our second and third rules on using parallel structure to enhance flow and emphasize relationships of ideas.

2. Use parallel structure after correlative conjunctions (either-or, neither-nor, not only-but also, both-and, whether-or, etc.).

In the following example, note how much more understandable the parallel versions are.

Not: The manager demands not only that daily time cards be punched but also employees must turn in weekly time statements.

But: The manager demands not only that daily time cards be punched but also that weekly time statements be turned in.

Or: The manager demands that employees not only punch daily time cards but also turn in weekly time statements.

3. Use parallel structure in headings and subheadings.

In the following list of a document's headings, note how consistency simplifies writing style and increases readability.

Not:
The Overall View
About the Terminal Phase
To Understand the Constant-Bearing Concept

But:
The Overall View
The Terminal Phase
The Constant-Bearing Concept

This edition was adapted from our Effective Business Writing Program. Previous editions may be read at http://www.uliveandlearn.com/newsletters/index.cfm.