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Another technique i'm aware of is...
Try to be "aware" that you are in the physical whilst in the daily life, for example... Every now and then look at your hands and feet to make sure you are not in a dream, or try another way to convince yourself that you are not dreaming (knowing that you're not).
What this will do is become a habit, and eventually you will do this whilst dreaming, and once you see that its a dream you will become aware and thus a "lucid dreamer".
That sounds like the best technique so far because like that no matter what situation your in in the dream youll at one point of another ask yourself if its a dream. Its funny how easy it is to distinguish the dream from day to day state by just asking the question and how real and static the dream is before you ask that question.