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. Summarizes the key facts, conclusions, and other important information in the body of the report. This ratio stops after about 30 pages, however. 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. 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. Omits citations for source borrowings.