Structure is the results developed through previous practices. Practice creates a new starting point for the next generation of practice. It ignores the case where ruling classes advance by the use of different ideologies. Denies the infighting in political parties over ideas. Ideology of scientific is the product of practical information which i is not reflective of the world.
Social relations obtain meaning through speech and language.
Meaning evolves through theoretical work. Althusser strives to identify ideological practices that differ from social practices. SROP are needed by the material existence of any social formation or any mode of productions. The greatest challenge is that the agents of productions in response to the labor must be continually reproduced. B. Althusser argues to increase capitalism in a socialist form, labor is not reproduced inside social relations but outside.