Expert review of the existing product against usability guidelines to determine what can be reduced, improved, or removed. More in-depth evaluations often include user scenarios with specific tasks that are analyzed against the guidelines to form a closer picture of the end-users' experience.
Example
This example is one page from a heuristic evaluation that I conducted for the HyVee Aisles Online program. The evaluation included going through tasks related to ordering groceries online and identifying areas of improvement as well as implemented best practices of note.
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Heuristic Evaluation
Heuristic Evaluations typically include a kickoff meeting and product review and result in a recommendations report. Prices vary based on the size of the project and the number of pages/tasks to review.