Garfinkel was influenced by phenomenology of Edmund Husserl and Alfred Schutz. Garfinkel's particular aim was to show that social order was locally produced. Common sense is biographical - in seeing the social world as stable as experience of it has developed over time from the individual's point of view. Reciprocity of perspectives and suspension of doubt is assumed by social actors.
The view of Schutz was that whereas scientists know so much of the world is not as it commonly appears, ordinary people assume that things are as they appear and that others as well as they will behave accordingly. For Garfinkel too there were two recommendations that the social settings were already practically accomplished and that people were practical enquirers. The practicality means people do not separate the action and the explanation: they are intertwined. Nor is there any covert motivation to be uncovered by sociologists, as the action is the meaning as involved.
Schutz saw that there are different rationalities, and in this he follows Weber. Not unlike Weber, scientific rationality leads to anomie, here because it undermines the given stock of knowledge and assumptions of reciprocity between people. Certainly sociologists should not try to impose a science of sociology on to the world, though this is because it misses meanings and because meanings and the social world as well as derived actions