Chapter 10: Abstracts
An abstract is a summary of a body of information. Sometimes, abstracts are in fact
called summaries--sometimes, executive summaries or executive abstracts. There
are different kinds of abstracts--your technical report uses two types: the
descriptive abstract and the informative abstract.
Note: Students enrolled in the online version of TCM1603 at Austin Community College, please take the reading quiz on this chapter. (Anybody else is welcome to try it as well.)
The descriptive abstract provides a description of the report's main topic and
purpose as well an overview of its contents. As you can see from the example in
Figure 10-1, it is very short--usually a brief one- or two-sentence paragraph. In this
report design, it appears on the title page. You may have noticed something similar
to this type of abstract at the beginning of journal articles.
In this type of abstract, you don't summarize any of the facts or conclusions of the
report. The descriptive abstract does not say something like this:
Problem: Based on an exhaustive review of currently available
products, this report concludes that none of the
available grammar-checking software products provides any
useful function to writers.
This is the style of summarizing you find in the informative abstract. Instead, the
descriptive abstract says something like this:
Revision: This report provides conclusions and recommendations on
the grammar-checking software that is currently
available.
The descriptive abstract is little like a program teaser. Or, to use a different analogy,
it like major first-level headings of the table of contents have been rewritten in
paragraph format.
Figure 10-1. Descriptive abstract on report title page.
The informative abstract, as its name implies, provides information from the body of
the report--specifically, the key facts and conclusions. To put it another way, this
type of abstract summarizes the key information from every major section in the
body of the report.
It is as if someone had taken a yellow marker and highlighted all the key points in
the body of the report then vaccuumed them up into a one- or two-page document.
(Of course, then some editing and rewriting would be necessary to make the
abstract readable.) Specifically, the requirements for the informative abstract are as
follows:
- Summarizes the key facts, conclusions, and other important information in the
body of the report.
- Usually about 10 percent of the length of the full report: for example, an
informative abstract for a 10-page report would be 1 page. This ratio stops after
about 30 pages, however. For 50- or 60-page reports, the abstract should not go
over 3 to 4 pages.
- Summarizes the key information from each of the main sections of the report,
and proportionately so (a 3-page section of a 10-page report ought to take up
about 30 percent of the informative abstract).
- Phrases information in a very dense, compact way. Sentence are longer than
normal and are crammed with information. The abstract tries to compact
information down to that 10-percent level. It's expected that the writing in an
informative abstract will be dense and heavily worded. (However, do not omit
normal words such as the, a, and an.
- Omits introductory explanation, unless that is the focus of the main body of the
report. Definitions and other background information are omitted if they are not
the major focus of the report. The informative abstract is not an introduction to
the subject matter of the report--and it is not an introduction!
- Omits citations for source borrowings. If you summarize information that you
borrowed from other writers, you do not have to repeat the citation in the
informative abstract (in other words, no brackets with source numbers and page
numbers).
- Includes key statistical detail. Don't sacrifice key numerical facts to make the
informative abstract brief. One expects to see numerical data in an informative
abstract.
- Omits descriptive-abstract phrasing. You should not see phrasing like this: "This
report presents conclusions and recommendations from a survey done on
grammar-checking software." Instead, the informative abstract presents the
details of those conclusions and recommendations.
This last point is particularly important. People often confuse the kinds of writing
expected in descriptive and informative abstracts. Study the difference between the
informative and descriptive phrasing in the following examples:
Informative: Based on an exhaustive review of currently available
products, this report concludes that none of the
available grammar-checking software products provides any
useful function to writers.
Descriptive: This report provides conclusions and recommendations on
the grammar-checking software that is currently
available.
ABSTRACT
Computerized speech recognition takes advantage of the most
natural form of communication, the human voice. During
speech, sound is generated by the vo cal cords and by air
rushing from the lungs. If the vocal cords vibrate, a voiced
sound is produced; otherwise, the sound is unvoiced. The
main problem in speech recognition is that no two voices
produce their sounds alike and that an individual voice va-
ries in different conditions. Because voices do vary and
because words blend together in a continuous stream in
natural speech, most recognition systems require that each
speaker train the machine to his or her voice and that words
have at least one-tenth of a second pause between them. Such
a system is called an isolated word recognition system and
con sists of three major components that process human
speech: (1) the preprocessor which removes irregula rities
from the speech signal and then breaks it up into parts; (2)
the feature extractor which extracts 32 key features from
the signal; and (3) the classification phase which
identifies the spoken word and includes the training mode
and reference pattern memory. Spoken words are identified on
the basis of a certain decision algorithm, some of which
involve dynamic programming, zero crossing rate, linear pre-
dictive coding, and the use of state diagr
Voice recognition systems offer many applications including
data entry, freedom for mobility, security uses, telephone
access, and helpful devices for the handicapped. However,
these same systems also face problems such as poor
recognition accuracy, loss of privacy among those who use
them, and limited vocab ulary sizes. The goal of the
industry is the devel opment of speaker-independent systems
that can rec ognize continuous human speech regardless of
the speaker and that can continually improve their vo-
cabulary size and recognition accuracy.
Figure 10-2. Informative abstract--this type summarizes the key facts and conclusions in
the body of the report. (By the way, speech recognition has come a long way since this
report was written in 1982!)
Revision Checklist for Abstracts
As you reread and revise your abstracts, watch out for problems such as the
following:
- Make sure that the descriptive abstract does not include informative abstract
phrasing; make sure that the informative abstract does not include descriptive
abstract phrasing.
- Make sure the descriptive overviews all the contents--all the major
sections--of the report.
- Make sure that the informative abstract summarizes all the major sections of
the report. (And don't forget--the informative abstract is not an introduction!)
- Make sure the informative abstract summarizes all key concepts, conclusions,
and facts from the body of the report (including key statistical information).
- Make sure that the informative abstract excludes general, obvious, deadwood
information and that the phrasing is compact and concentrated.
- Make sure that the informative abstract is neither too brief (less than 10
percent) nor too long (more than 15 percent).
Return to the table of contents for the TCM1603 Course Guide
(the online textbook for Austin Community College's online
technical writing course).
This information is owned and maintained by David A. McMurrey. For
information on use, customization, or copies, e-mail
davidm@austin.cc.tx.us or call (512) 476-4949.