Scientific writing is not just presenting facts, it is about telling your story; the one you have unveiled in the research. Generally you have to tell the story systematically so that your reader is capable of grasping the main idea of the research. It is not to be forgotten that there are various readers; each and every one of them understands the story in different ways, and that is the beauty of it. For the writer however this "beauty" comes with a great pain. The writer therefore have to put the shoes of the reader and he should write so that the reader can understand what is said. One thing has to be remembered, what scientists do in researches is creating knowledge and if that knowledge can not be transferred to the common world then there is no use of doing the research.
The scientific story starts with an "introduction"; a small briefing to the veil that is to be unveiled. In introduction, what the writers usually do is explaining the background of the study:
Lets assume that the topic of the study is "Scientific Writing", then in the introduction it is to be explained, what exactly is "Scientific Writing"; why people use it, and what kind of pros and cons are there. In many occasions the readers will find that, by reading the introduction a general picture about the whole study can be visualized, but an introduction is just a beginning; you cannot comment on the research just by reading the introduction. In an introduction, writers may explain in brief, the ongoing studies as well as the problems associated with them.
In my brief study about the art of scientific writing, I found that the introduction is like the key to the map to the treasure of knowledge created; the knowledge which is somewhere hidden. With every word the writer is telling us what is the destination and its significance. It is the key to the map. If someone could not put the right key there at the beginning, nobody is going to find that hidden treasure- the irony is that the scientists want that treasure to be found- but it will remain hidden.