Task complexity

0. meeting
1. short message ("ask..."), minor changes in docs, control, etc.
2. medium message ("answer..."), write brief text, etc.
3. add meeting minutes, large message, write medium text, etc.
4. write large text, collect small quantity, etc.
5. collect medium quantity, data analyze
6. collect large quantity, document analyze
7. small design
8. medium design
9. develop algorithms, large design, etc.