Jakob Nielsen, Ph.D., is a retired principal and co-founder (with Dr. Donald A. Norman) of the Nielsen Norman Group. Jakob established the "discount usability engineering" movement for fast and cheap improvements of user interfaces and invented the heuristic evaluation method.
The user experience of mobile websites and apps has improved since our last research, but still has far to go. A dedicated mobile site is a must, and apps get even higher usability scores.
Users often leave Web pages in 10–20 seconds, but pages with a clear value proposition can hold people's attention for much longer. To gain several minutes of user attention, you must clearly communicate your value proposition within 10 seconds.
Mobile use will rise, but desktop computers will remain important, forcing companies to design for multiple platforms, requiring continuity in visual design, features, user data, and tone of voice.