How many interviews are needed for validation?

To validate hypotheses through interviews, it is usually sufficient to conduct between 5 and 15 interviews. In practice, the first 5-7 interviews help identify main patterns and issues, while subsequent ones refine and test hypotheses. If no new insights emerge after 10-15 interviews, it can be considered that the saturation point has been reached. The number depends on the complexity of the topic and the diversity of the target audience.