Sammy Tippit’s book The Prayer Factor (Published in 1988) has been updated in 2007. Here’s a summary from the book back cover:
ONE FACTOR can REVOLUTIONIZE your LIFE,
our CHURCHES AND our SOCIETY:
THE PRAYER FACTOR.
The Prayer Factor includes 12 chapters of stories and instruction with study questions that show readers how to move from hindrances and failure to possibilities and victory in prayer. Learn the great truths about prayer and make your life a testimony to a God who hears and answers prayer.