Related Clues:

• Basis
• Reasoning
• Grounds
• Logic
• Explanation
• Why and wherefore
• Underlying principle
• Fundamental principle
• Underlying reason
• Thinking
• The logical basis of some thing or action
• Is that the reason behind having to restrict the beer allowance?
• The theory behind this is to allow only so much beer, it seems
• Allowed only so much beer, perhaps, and with reason
• The reasoning behind this is only to allow so much beer