This text draws on an Entrepreneur.com article.
Too much work
A very common reason for high turnover is simply being overloaded with work. If your subordinates have to do so much work that they are overwhelmed and stressed out, no benefits or bonuses will prevent them sooner or later leaving.
Neglected employee development
Education and development top the list of things desired by employees. If you neglect employee development, it may very well happen that they become frustrated by stagnating in one place.
Toxic working environment
A toxic working environment can take many forms. It might be bullying from management, non-transparent communication, gossiping, workaholism, or tolerance of dishonest behaviour by some employees.
Poor onboarding
If you do not train newcomers properly, do not explain to them what they should be doing or fail to enthuse them for the vision of the team or company, you cannot be surprised if they are disgruntled.
Micromanagement or boring job
Very often employees leave simply because they lack job satisfaction. There may be several reasons for this; a frequent one is micromanagement by the team leader, which leaves employees no room for their own initiative. Or it is simply the fact that the job is boring.
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