Heuristic evaluation is the most popular of the usability inspection methods. Heuristic evaluation is done as a systematic inspection of a user interface design for usability. The goal of heuristic evaluation is to find the usability problems in the design so that they can be attended to as part of an iterative design process. Heuristic evaluation involves having a small set of evaluators examine the interface and judge its compliance with recognized usability principles (the "heuristics").
How can I Use Heuristic Evaluation on my Site?
1. Plan Your Evaluation
Identify and test the tasks that are critical to your site's success - you'll want all visitors to be able to perform these - and any elements expected to cause difficulty for your site visitors.
2. Provide evaluators with the goals of the system, and allow them to develop their own tasks.
An example goal might be "users should be able to find out how much product x costs." Evaluators can then break this goal down into appropriate tasks, and test each in turn.
3. Ask evaluators to assess your dialogue elements.
Ask evaluators to go through the interface a number of times and examine and assess the efficacy of those elements of your Website that contribute to a dialogue with your site visitors.
Choosing which method to use will depend on you, the time that you have available, and on your evaluators. For example, if you were evaluating with young children, the most appropriate method would be to develop a set of tasks and ask them to carry them out. Children will find this much more achievable than trying to develop their own tasks, or assessing your Website elements without any obvious aims.
4.Choose your Evaluators
The more evaluators you use, the more usability problems you'll reveal. However, studies on the subject have shown that the benefit/cost ratio decreases at about five evaluators. So who should these evaluators be?

i) Those with experience
if you can find 5 evaluators who are experts in software ergonomics, and in the field in which the software is applied, a well-planned evaluation program will typically find 81%-90% of usability problems with your interface.
ii)Those without experience
if you don't have 5 free experts at your fingertips, don't worry. A student with no knowledge of software ergonomics will find 22% to 29% of usability problems.