Productivity Systems: planning and focus

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I'm learning "Productivity Systems: planning and focus" on The Future Market. Lesson 1: "Before this course, and does time management work?".

What the lesson teaches:
- Aeon, Faber and Panaccio (2021, PLOS ONE) combined 158 studies with 53,957 participants. They found that time management is moderately related to job performance (correlations around r = .25), academic achievement and wellbeing. The link to wellbeing (especially life satisfaction) was slightly stronger than the link to performance.
- Honest limits the authors list: most studies are cross-sectional (a snapshot), so they cannot prove that time management causes better results; results differ a lot between studies; training programmes are often poorly described; and being good at time management can depend on income, education and privilege.
- A correlation of .25 means time management explains a small part of the differences between people (r squared is about 6%). It is real, but it is not the whole story.
- Why a "system"? A system is a small set of habits and tools that you repeat: where tasks go in (capture), when you plan (weekly plan), when you focus (blocks), and how you check it (review).
- Tip: judge any productivity method by one question: "Did my own measure get better over two weeks?" You will do this in Lesson 7.
- Common claim - Better question
- "This app will double your output." - Compared with what, measured how?

The exercise I'm working on:
Rewrite one productivity claim with a size and a limit. Keep both versions.

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.

I'm a parent helping my child (about 8 years old) with a lesson called "Before this course, and does time management work?" from the course "Productivity Systems: planning and focus".

Here's what the lesson says:
A new backpack might help you carry your books, but it will not do your homework. A productivity system is the same: it helps, but it is a tool, not magic. Before we build one, let us ask how much it really helps.

The activity:
Rewrite one productivity claim with a size and a limit. Keep both versions.

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.