1. Engineering can be defined as the application of scientific knowledge for practical purposes, especially in industry. While there are many definitions, engineering essentially represents techniques, applications, and processes used to create products and solve problems through textual representations. 2. Scientific texts are key to engineering because they represent phenomena, behaviors, techniques, and processes. Complex technical documents are also important as they accurately describe products and operations in a stable, simple, and explanatory way despite variations. 3. The main difference between science and engineering is their goals - science aims to observe and explain while engineering aims to take action and create changes. The same texts can be considered science or engineering depending on whether the aim is observation or application.