Step 1: The science side in practice:
A manager uses scientifically derived tools (e.g. break-even analysis, budgeting, statistical quality control) the same way every time the underlying conditions are similar — this repeatability and universality is the mark of science.
Step 2: The art side in practice:
No two organisational problems are identical even when principles are the same, so managers must use judgement, experience, and creativity to adapt the science to the specific case — this personalised, skill-based application is the mark of art.
Step 3: Conclusion:
Since real managerial success needs both the systematic knowledge base and the personal skill to apply it, management is correctly described as 'the oldest of arts and the youngest of sciences.'
Final Answer:
Management blends scientific principles with the art of applying them — it needs both a sound knowledge base and skilled, situation-specific practice to succeed.