Use a funnel approach to move from general to specific
A funnel approach is a common way to structure your introduction, especially in the natural and social sciences. It means that you start with a broad and general topic, and then gradually narrow it down to a specific and focused research question or hypothesis. This way, you can show how your paper fits into the existing literature, and why it is important and original. A funnel approach typically consists of four elements: background, gap, purpose, and hypothesis. Here is an example of how to use a funnel approach in your introduction:
Background: X is a phenomenon that affects millions of people around the world. It has significant implications for health, social, and economic outcomes. Previous studies have identified several factors that influence X, such as age, gender, education, income, etc.
Gap: However, most of these studies have focused on individual-level factors, and have neglected the role of contextual factors, such as culture, environment, policy, etc. There is a need for more research on how contextual factors shape X, and how they interact with individual-level factors.
Purpose: Therefore, this study aims to fill this gap by examining how culture, environment, and policy affect X in different regions of the world. Specifically, this study compares X in three regions: North America, Europe, and Asia.
Hypothesis: Based on the literature review and the theoretical framework, this study proposes the following hypothesis: Culture, environment, and policy have significant and differential effects on X in North America, Europe, and Asia.