Interaction with the user in Information Retrieval Systems allows the formulation of more efficient queries that produce better results. Relevance feedback is a process where users identify relevant documents in an initial list of retrieval documents, and the system then creates a new query based on positive and negative examples of those documents. The user interface is an important element in the process. Usually followed process in relevance feedback technique and experimental results are shown. They allow estimating  the degree of improvement in the results of the retrieval by means of these systems.