Fantastic book by Stephen R. Covey
If you’re into self-improvement I couldn’t recommend this highly enough.
Four generations of time management:
1st generation – notes and checklists
2nd generation – calendars and appointment books
3rd generation – important idea of prioritisation, of clarifying values, and of comparing the relative worth of activities based on their relationship to those values
4th generation – recognises that “time management” is really a misnomer-the challenge is not to manage time, but to manage ourselves
5th generation – tbc