Where is my quality score tab ?

I want to see my QS but dint find anywhere in my campaign ?????

 

I find the easiest way to see it - use the adwords editor, download the campaign and your qs for each keyword is listed under the keywords tab

 

I you are using the old interface of the adwords then you have to go to ad group detail page, click on customize columns and select show quality score.
and if you are on new interface then bring your mouse over the keyword, it will how your quality score.