What does it mean that capacity for different types of work?

You may have different capacities for creative work analytical work and social interaction.

Example: A product manager finishes four hours of writing a product strategy document — generative, open-ended work that requires holding ambiguity in mind while synthesizing multiple inputs. She is spent. She cannot write another coherent paragraph. But she sits down and runs a two-hour data analysis on conversion funnels — convergent, detail-oriented work that requires following logical steps to a precise conclusion — and feels engaged, even energized. Afterward, she takes a one-hour call with a client, navigating social dynamics and reading emotional cues. By 5 PM she has done seven hours of high-quality work, not because she had seven hours of generic 'capacity' but because each type of work drew from a separate cognitive pool. Creative was exhausted by noon. Analytical was fresh until 3 PM. Social had barely been touched until 4 PM. She sequenced across pools instead of draining one until it broke.

Try this: For one full work week, track every work block of thirty minutes or more. Classify each block into one of four types: creative (generative, open-ended — writing, designing, brainstorming, strategizing), analytical (convergent, detail-oriented — debugging, data analysis, financial review, proofreading), social (interpersonal — meetings, calls, collaboration, difficult conversations), or administrative (logistical — email, scheduling, filing, invoicing). At the end of each day, note the time at which each type became noticeably depleted — the point where quality dropped, resistance spiked, or you started avoiding that type of work. By Friday, you will have a rough capacity map: your daily ceiling for each type and the depletion curve for each pool.