In which instances would collecting data about employees lead to infringement of employee privacy?

Given the prime role it plays in organizational success, employee engagement has of late been the focus of many research studies and reports. An engaged worker is one who feels passionate and enthusiastic about their job and their workplace. Studies show that engagement can have a significant impact on organizational outcomes. For example, research conducted across the retail giant Marks &
Spencer over a four-year period showed that an improved employee engagement led to an increase of £62 million in sales every year compared to stores with low employee engagement. A similar study at Sainsbury’s, one of the biggest grocery stores in the United Kingdom, demonstrated that employee engagement led to a 15 percent increase in a store’s year-on-year growth