The Introduction

The introduction is where you sketch out the background of your study, including why you have investigated the question that you have and how it relates to earlier research that has been done in the field. It may help to think of an introduction as a telescoping focus, where you begin with the broader context and gradually narrow to the specific problem addressed by the report.

My personal view is that once an Introduction begans to exceed several thousand words, the background/context should be summarized in the Introduction, but the detail needs to be removed and put in a separate section following.

A typical (and very useful) construction of an introduction proceeds as follows:

Three to seven sentences or more placing your study subject in context. If the study documents a case study that was remarkable, the evidence that the event was remarkable should be contained here.
Examples

Follow with a description of the problem and its history, including previous research. Pay special attention to how your research adds to the previous or bridges a gap.
Examples

State what information your article will address.
Examples