In school, the purpose of reading is usually to help you pass a test or complete an assignment. In business, it is usually either to orient yourself to new material or to help you solve a problem.
Orientation reading involves reading as a wandering generality.
In this mode, you are looking for the unexpected. Orientation reading is also useful for building vocabulary and acquiring basic concepts useful for communicating with team members. Since there is no feedback loop to tell you when you are done, it is important to set time limits when reading in orientation mode. In several industries today, there is far more information in trade journals and books than most people have time to read. To spend too much time reading general trade information is to risk not getting anything done.