Readings (perspectives of the art and science of canadian nursing) Concept: an idea that we conceive (in our minds) to represent the world around us. Typically, a concept is a general abstract notion or idea about particular things that we see, hear, feel, taste and touch (concrete things). Notions or ideas can also be about things that are abstract (things that we cannot claim to experience through our senses; e. g. notion of spirit. Critical social theories: theories suggesting that social reality historically produces power imbalances that can be critically examined. Knowledge, applied to critically analyze and challenge these realities, can serve to emancipate (free) people from the social forces of domination, oppression or marginalization by others in power. The intent of cst is to bring about positive changes in the conditions that affect people"s lives. Grand nursing theories: theories offering a general orientation or philosophical stance about nursing.