They have presented mutually contradictory ideas concerning moral problems and moral field. Their philosophical language is very much dissimilar.
Of these theories the most important representative moral theories are as follows:
1. Sceptic theories:
These theories raise doubt in the rational meaning of moral judgment Moral judgments; according to them are emotive expressions. This class includes the logical positivists, the behaviorists and psycho-analysts and Sceptic theory in sociology.
2. Approbative theories:
According to these theories moral predicates are not rational though they involve some rational element.
In fact they are a probative and very much based upon emotions and likes and dislikes. These theories include moral sentiments theories, social approbative theories and religious approbative theories.
3. Process theories:
According to these theories the moral concepts aim at the progress of a dynamic process which being always incomplete cannot fix the moral interpretations.
This classification includes evolutionary theories, Marxist theories, Pragmatist theories and Humanist theories.
4. Psychological theories:
According to these theories moral predicate is not rational but has psychological value. The good means according to desire, liking or feeling which are psychological states and the right means their progress.
This class of moral theories includes hedonistic theories, feeling theories and theories based upon likes and dislikes.
5. Intuitive theories:
According to these theories moral predicates are unique and cannot be explained in terms of any other types of experiences.