Answer to Question 1
Answer: A synopsis (or abstract) is simply a brief overview of the report's most important points. An executive summary is a fully developed mini version of the report itself.
Executive summaries are often more detailed than synopses, including images and headings just as the actual report does.
Answer to Question 2
Answer: Prefatory parts are placed before the text of your report. However, many of these parts (such as the table of contents, list of illustrations, and executive summary) are easier to prepare after you've written the report because they are based on the main text. Other parts (such as the cover and title page) can be prepared at almost any time.
A Summary of Janis’s Conception of Groupthink
Summary of Guidelines for Safe Use of Moist Hot Packs Before and During Massage
Summary of the digestive activities
Resting Membrane Potential: Voltage Difference
Summary of Cranial Nerves
Summary of digestion and absorption in the small intestine