The technique scanning or looking for specific information is very useful when you know exactly what you are looking for in a text. Since you have a very specific goal in mind, when you read, you only read the relevant part(s) and ignore the irrelevant.
Very much similar to reading for main points (R5), you could start by making a list of points you would like to locate in a text. The list will help you find the relevant points in the text. Now, before you do some practice, read the tips in the following section. You could use the list as an exercise for scanning. To do this, please follow the steps below:
Predict one or two tips that you think are relevant to scanning. You could either write them down or remember them.
Read and see if the following list contains your prediction.
Read the tip(s) that you have predicted correctly, and ignore the rest.
If you have done all of the above steps in 30 seconds, congratulations! You should be quite skillful in scanning and need not read on.