What does it mean that time blocking creates dedicated capacity?

Assigning specific blocks of time to specific types of work ensures important work gets done.

Example: A software engineer spends Monday through Friday 'working on the product,' but every week ends with the same realization: the critical database migration never started. She tried willpower. She tried prioritization frameworks. Nothing changed — until she blocked Tuesday and Thursday mornings, 9 to 11:30, exclusively for deep technical work. Within two weeks the migration was complete. The time was always there. What was missing was the assignment.

Try this: Open your calendar for next week. Identify the single most important piece of work you need to advance. Block a minimum of 90 uninterrupted minutes for it on at least two days. Label the block with the specific work, not a category — 'Write migration scripts for user table' rather than 'Deep work.' At the end of the week, compare what you accomplished in those blocks versus equivalent unblocked time.