Addresses the concept that one who is “involved” in one mitzvah is exempt from another mitzvah, and discusses when exactly this principle applies, and when it does not. For example, one who is wearing tzitzis or tefillin is not exempt from all other mitzvos.  We will also explore situations where one is not obligated to do the mitzvah even if it would not distract him from the first mitzvah, since Hashem does not expect us to do two things at once.