it's an acronym, Specific, Measurable, Achievable, Relevant, and Time-Bound. So if you're struggling to read books say, "Finish this book by the end of the month" is:

Specific: read the book Measurable: no ambiguity as to whether you've read it Achievable: a month is a reasonable amount of time to finish a book in Relevant: read a book to improve your reading habits Time-bound: it's not a project that'll hang over you for ages, you're done at the end of the month