What are the strengths and weaknesses of the four-principles approach?

Strengths: open to different moral convictions and to the specifics of each case, a search matrix for spotting conflicts, a structure for working through them, broad acceptance in a pluralistic society, and more transparency. Weakness: limited problem-solving power, since it rarely yields a definitive answer, so intuition and subjective weighing return exactly in the hard cases.

The approach leaves a lot of room for judgement when applied, which is its strength and weakness at once.

Strengths:

• open to different basic moral convictions and the specifics of the case, which explains its popularity,
• offers room for compromise in conflicts,
• a search matrix (Suchmatrix) to identify ethical conflicts in everyday clinical work,
• structures the work on a problem, allowing a step-by-step approach in complex cases,
• supports consensus, since it links to widely shared morality and traditional medical ethics, and enjoys broad acceptance in a society of value pluralism and religious diversity,
• increases transparency by presenting conflicts as conflicts between differently weighted principles.

Weaknesses:

• limited problem-solving potential: definitive solutions rarely follow from the approach itself,
• intuitive judgements and subjective weighing become unavoidable exactly where theory is most needed, in hard conflicts,
• the weighting may really be decided by underlying convictions: someone who sees preserving life as the highest command will lean towards treating; a consequentialist focused on the patient's benefit may not. The consensus on the mid-level principles may thus be superficial.

There is no easy algorithm for ethical problems, and one would not fit the complexity of clinical conflicts anyway.

Go deeper:

• Wikipedia: Principlism — the criticism section on the approach's lack of a theory to settle conflicts.