Moral philosophy is usually presented as three broad families: theories of rules, theories of outcomes and theories of character. The division is durable because each starts from a different question.
Rule-based approaches ask what is permitted
These theories treat certain acts as required or forbidden regardless of consequences, and locate morality in duties that hold independently of results.
The appeal is that some prohibitions do seem to hold whatever the circumstances, and a theory that made every rule negotiable would fail to capture that.
The difficulty is conflict. When two duties cannot both be met, the framework must supply a way to rank them, and the ranking is contested.
Outcome-based approaches ask what results
These theories evaluate actions by their effects, treating the better outcome as the right choice and requiring comparison across the options available.
The appeal is that consequences plainly matter, and any theory that ignored the effects of an action on people would be missing something obvious.
The difficulty is that comparison requires a common measure, and outcomes affecting different people in different ways resist being placed on one scale.
Character-based approaches ask what kind of person acts
These theories start from dispositions rather than acts, asking which traits a good life requires and how they are formed by habit and upbringing.
The appeal is that moral life is largely a matter of perception and habit rather than deliberation, and most decisions are made without any explicit reasoning.
The difficulty is guidance. A framework that describes the person to become says less about what a particular person should do this afternoon.
Each family absorbs the others incompletely
Sophisticated versions of each theory account for what the others emphasise, admitting rules that track consequences or virtues that include respect for duty.
The absorption is never quite complete, and the starting question continues to shape which cases the theory handles gracefully and which it strains over.
This is why the three-way division survives revision after revision rather than resolving into a single framework.
Ordinary reasoning uses all three
People deliberating about a real decision typically appeal to duties, effects and character in the same conversation without noticing the shift.
Philosophers sometimes treat this as confusion, but it may instead indicate that moral thought draws on several genuinely distinct considerations.
On that reading the theories are not competitors to be chosen between so much as descriptions of different parts of what people already do.