How to measure your window for blinds

The purpose of this guide is to advise you on how best to measure your window for blinds.
You will need:

1. Tape measure (metal ones are best)
2. Paper and Pen
Exact or Recess?
Exact
This is when you want your blinds to hang outside the recess. (See figure 1.1)
Recess
This is when you want you blind to fit inside the recess. (See figure 1.2)
Handy Hints
* Take all you measurements in centimeters to the nearest 0.1cm (1 mm).
* When measuring, always look out for