The Alastair method is a methodology in the context of bullet journaling that takes the monthly workload as its principal unit of measurement. Evidently, such a method will mostly be dedicated to monthly workload planning, but it can also be used for weekly and yearly segments. Essentially, the idea is to create a list of tasks or events that can be attributed to each week, month, or year as the case may be, ordering them any which way you like (though with priority often given to the most important).