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Consistency

Consistency is essential for clarity. This section discusses consistency in language, formatting, and units.

If your paper was written by multiple authors, assign one author to check the whole paper for consistency.

Language

Writing quality

Some papers have significant variation in English quality. For example, the Introduction is well written but the Discussion is full of mistakes. This is usually the result of multiple authors writing the paper. See the tip above.

Terminology

To make your paper easier to read and thus avoid reader frustration and confusion, use consistent terminology.

Mistake
  • The author uses multiple terms to refer to the same thing.

Remedy
  • Use one term for a given concept.

Example 1. Inconsistent terminology
incorrect

(page 3) …​ software bugs are detected using …​
(page 7) Our method identified 85% of the software faults …​

correct

(page 3) …​ software bugs are detected using …​
(page 7) Our method identified 85% of the software bugs …​

In addition, the terminology in your paper should be consistent with that used in the literature. For example, if papers in your field use "self-assembling" when referring to nanosystems, do not use "self-arranging", even though the meanings are similar.

Using inconsistent terminology makes your paper difficult to read and difficult to find (e.g., for the example above, your paper will not show up in searches for "self-assembling").

Key verbs should also be consistent. For example, if your paper refers to a module being "activated", do not also use "triggered" if you mean "activated".

If you mean the same thing, use the same word; don’t make the reader guess.

Spelling

Journals sometimes indicate whether they prefer US or British spelling. If no preference is given, choose one and use it throughout the paper.

Style

Your paper should follow a consistent style. For example, for lists of items, use either "A, B, and C" (Oxford comma) or "A, B and C".

Mistake
  • The author uses multiple styles for lists of items.

Remedy
  • Choose one style and use it throughout the manuscript.

Example 2. Inconsistent style
incorrect

(page 3) In the first, second, and third trials, we measured …​
(page 8) …​ temperature, viscosity and velocity, respectively.

correct

(page 3) In the first, second, and third trials, we measured …​
(page 8) …​ temperature, viscosity, and velocity, respectively.

correct

(page 3) In the first, second and third trials, we measured …​
(page 8) …​ temperature, viscosity and velocity, respectively.

Formatting

Formatting should be consistent unless stated otherwise in the guidelines.

Fonts

The font size, font (Times New Roman, Ariel), and font style (bold, italic) should be consistent for a given type of text. For example, the main text might need to be 10-point Times New Roman, but figure captions might need to be 8-point Times New Roman and bold.

Section headings are often larger than the main text. First-level headings might need to be bold and second-level headings might need to be italic. See Headings below.

Mistake
  • The author uses a foreign font (e.g., PMingLiu, Mincho) for symbols, punctuation, or other text.

Remedy
  • Do not use foreign fonts. Such fonts cause problems with formatting (e.g., line spacing is increased).

Example 3. Asian fonts
comment

Note how the foreign font (PMingLiu) increases line spacing.

incorrect

asian font incorrect

correct

asian font correct

Indentation

There are generally three indentation formats:

  1. Paragraphs are not indented.

  2. All paragraph are indented.

  3. All paragraphs except the first one in a section are indented.

Check guidelines for the required format.

In-text reference citation format

Headings

There are several heading formats. Check guidelines for the required format.

Example 4. Headings
Capitalization
example

Results and Discussion

example

Results and discussion

example

RESULTS AND DISCUSSION

Numbering
example

1. Introduction
1.1. Background

example

1 Introduction
1.1 Background

Font style
example

1 Introduction
1.1 Background

Alignment
example

1 INTRODUCTION

1.1 Background

Equation format

Equation numbering and punctuation should be consistent. For more on equations, see the Equations section.

Table format

Table numbering (Table 1, Table 2, etc. or Table I, Table II, etc.) and captions should be consistent. For more on tables, see the Tables section.

Figure format

Caption numbering ("Fig. 1.", "Figure 1", etc.) and the figure and subfigure caption format should be consistent. For more on figures, see the Figures section.

Units

Make sure that units are consistent. For example, use "ml" or "mL", but not both.

Mistake
  • The author uses both "ml" and "mL".

Remedy
  • Choose "ml" or "mL" and use it throughout the manuscript.

Example 5. Mixing of "ml" and "mL"
incorrect

(page 3) …​ a flask containing 300 ml of …​
(page 7) …​ various cell volumes (5, 10, and 15 mL).

correct

(page 3) …​ a flask containing 300 ml of …​
(page 7) …​ various cell volumes (5, 10, and 15 ml).

correct

(page 3) …​ a flask containing 300 mL of …​
(page 7) …​ various cell volumes (5, 10, and 15 mL).

When several units can be used for a parameter, choose one and use it throughout the manuscript. For example, use Kelvin or Celsius, but not both.

Reviewers complain about inconsistent units because they make comparison difficult. Use consistent units.

For units, use x/y or xy-1, but not both.

Mistake
  • The author uses an inconsistent unit format.

Remedy
  • Choose one unit format and use it throughout the manuscript.

Example 6. Inconsistent unit format
incorrect

(page 3) …​ the velocity was 3.4 m/s.
(page 13) …​ the density was 5.4 g·mL-1.

correct

(page 3) …​ the velocity was 3.4 m·s-1.
(page 13) …​ the density was 5.4 g·mL-1.

correct

(page 3) …​ the velocity was 3.4 m/s.
(page 13) …​ the density was 5.4 g/mL.

Spaces around "="

Use "x=y" or "x = y", but not both. I’ve also seen "x =y" and "x= y" (both incorrect), sometimes in the same paper.