Google has an AdWords engineer named Tanmay A Arora who has been giving tips on AdWords topics in the Google AdWords Help forums.

First Tanmay explained the "Ingredients" In AdWords Quality Score.

The latest give by Tanmay was named the "perfect Quality Score sauce." Tanmay goes through what the steps you can use to achieve that perfect quality score. Here they are:

(1) Add Keywords

Take an existing campaign and add more keywords to it after having a look at your ‘See search terms’ report. As I mentioned before, Google takes into account the Exact match Click through rate (CTR) for the keyword, It is important to look at this report and keep adding new keywords to your keyword list, which will exactly match the search query, irrespective of the match type they are in.

(2) Add Negative Keywords

It is also recommended that you add negative keywords after looking at the ‘See search terms’ report, this will help you to avoid getting impressions for irrelevant search terms and help in improving the CTR.

P.S. This is a very important resource and you should regularly add keywords and negative keywords on the basis of this report to assure optimum account performance.

(3) Pause Keywords

‘Low search volume’ keywords and keywords with a lot of impressions but very few clicks i.e. ones having a very poor CTR, have an impact on the overall performance of the account and hence you should consider pausing these keywords.

(4) Set The Right Parameters Perfectly (Temperature)

Make sure that you are bidding competitively. The better your ad position, higher the chances of improving CTR for the display URL and keyword. At the least, try to make sure that your max CPC is in line with the estimated first page bid. And for the real competitive edge, switch to manual bidding and go all out.

(5) Garnishing

You know the value of your products and services, its time others know what you have to offer. This is where the presentation of the dish makes the cut.

Make sure you create ads that are more attractive, having call to actions phrases and also include more USPs about your company and services, so that the user finds them attractive. Here are some call-to-action words that you may want to consider using: Buy, Sell, Order, Browse, Find, Sign up, Get a Quote. Also, don’t forget on the inter capitalization in your ad text.

Those are the tips by Google for Google AdWords advertisers.

Forum discussion at Google AdWords Help.