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In every design implying a nominal, the rule of Magical Number Seven, Plus or Minus Two states that the number of nominal value should not be more than <math>7 \pm 2</math> otherwise the brain will not be able to cope with it, ie:

• to remember it (ie more than 10 departments)
• to manage them (ie team of more than 7 members)

Articles Related

Documentation / Reference

• The Magical Number Seven, Plus or Minus Two