Yes! you can learn a foreign language
If you review a new word, expression, or grammatical point 10 minutes, later, one hour later, and the next day, that new item has a greater chance of registering in your long-term memory.
This is what research has demonstrated, and this is what the authors tell us on pages 24-26.
I admit, this is a very valuable item. I am studying a non-Indo-European language, and I have been having trouble committing words to long-term memory.
However, in order to learn this one bit of knowledge, I had to suffer through countless platitudes--efficient study habits, thinking in the second language, setting realistic goals, grouping related words, watching for non-verbal cues, watching for cognates, writing well-organized essays. If these topics are already familiar to you, then you can probably write a foreign language learning strategy book which is almost as good.
The book briefly covers every aspect learning another language - assessing your motivation to learn, particular memory and study skills, writing systems, and assessing formal classroom instruction in a way that encourages the reader to press on despite the difficulties. Excluding some the dated content referencing the application of records, video tapes, and laserdiscs most of the content is still relevant today.
The book was a short yet informative read that really elaborated how I learned my own languages (fluent in Spanish and English) and introduced new ideas to learn more efficiently and effectively. No doubt that this book will be of some benefit to anyone if they even have the smallest inkling to learn another language.