捗る and 進捗: favorable progress and a status to report
Compare reading that goes well and work advancing beyond expectations with weekly progress reporting and a plan on schedule, keeping degree distinct from completion.
捗る: reading well and exceeding expectations
捗る (はかどる) means to make progress or to proceed smoothly. 「静かな場所では読書がよく捗る。」 means “I make good progress with my reading in a quiet place.” Reading goes well in a quiet place. よく expresses favorable progress, without saying a particular book has been finished or that the same reading speed applies everywhere.
「皆で分担したので作業が予想以上に捗った。」 means “Everyone divided up the work, so we made more progress than expected.” Dividing up the work led to more progress than expected. 予想以上に gives the degree compared with expectations, and 捗った is past. More progress does not mean a fixed fast speed or completion of the whole task.
進捗: weekly reports and progress against a schedule
進捗 (しんちょく) means progress. 「作業の進捗を毎週の会議で報告する。」 means “We report the project's progress at the weekly meeting.” The project's progress is reported at the weekly meeting. 進捗 names the status being reported; the weekly frequency itself does not establish completion.
「計画は予定どおりの進捗を見せている。」 means “The plan is progressing on schedule.” The plan is progressing on schedule. This is a status relative to a schedule, distinct from the evaluation of more progress than expected in the 捗った example.
Separate favorable progress from a finished task
With 捗る, look at how well an activity is advancing or how its degree of progress compares with expectations. With 進捗, look at the status reported or checked. Neither focus turns progress information alone into completion.
Smooth reading, shared work exceeding expectations, weekly progress reports, and a plan on schedule are separate examples. Do not move the shared task's favorable comparison into the plan's schedule or give every example a fixed speed.
What is the focus of work that 予想以上に捗った compared with reporting 進捗 every week?
Show the answer and why
The first evaluates how shared work advanced more than expected; the second identifies the work status reported. Exceeding expectations and reporting weekly do not mean full completion. The on-schedule plan also has its own status in a separate example.