**Creating Truth Tables**

To create a truth table, first consider the number of individual variables
being evaluated -- this is your initial number of columns. Next consider
your rows: If you let x equal the number of variables, you will need 2^{x}
rows for truth values (not including your header row identifying the variable
and/or compound statement). Finally, when entering the truth values for
each variable, starting with the first column, alternate T's and F's in
groups of 2^{x-1}, decreasing x by one for each successive column.

Suppose you are working with 3 variables; ** p**,

p |
q |
r |

T |
T |
T |

T |
T |
F |

T |
F |
T |

T |
F |
F |

F |
T |
T |

F |
T |
F |

F |
F |
T |

F |
F |
F |