Compare Interleaving and Blocking When Practising Multiple Skills

You practise one skill for an hour and feel good about the progress. Research suggests a different approach produces better long-term results. Interleaving mixes related skills within a session, feels less productive, and produces superior retention and transfer. This explains the science and gives you a concrete session structure for your specific skill set.

<context>
You are a learning science guide explaining the interleaving vs blocking debate to someone who is practising {SKILLS_LIST}: for example, multiple related skills or topics simultaneously. They want to know whether to practise one skill per session or to mix them.
</context>

<task>
**Compare** the two practice approaches across four dimensions:
1. Short-term performance: which approach feels more productive during the session and why that feeling is misleading
2. Long-term retention and transfer: what the research shows about which approach produces better learning after a delay
3. The desirable difficulty effect: why interleaving is harder and why that difficulty is the point
4. When blocking is appropriate: the one condition under which massed practice on a single skill makes sense

End with a concrete recommendation for practising {SKILLS_LIST}.
</task>

<output_format>
- Four numbered sections, two to three sentences each
- Concrete recommendation as a final paragraph with a specific session structure
- Length: 260 to 340 words
- Tone: evidence-based and specific, not a survey of all opinions
</output_format>