Rural diners used to post signs promising "Sudden Service." Some probably still do. This book is intended to offer much the same thing: quick access to help you get an immediate job done using the NIK filters. You can read it end to end. But you'll often find it more useful as a handy reference to help you get the most from the NIK filters. In fact, you can carry this book in electronic form, right on the iPad itself. Check the Contents or the index for the job you need to do; then, you can jump directly to that section. Cross-references lead you to other helpful information.