Table 1:
Kind | Time | Label | Value | Measures |
---|---|---|---|---|
Zero | ○ | ○ | ○ | nothing |
First | ○ | ○ | ● | how |
First | ○ | ● | ○ | what |
Second | ○ | ● | ● | what & how |
First | ● | ○ | ○ | when |
Second | ● | ○ | ● | when & how |
Second | ● | ● | ○ | when & what |
Third | ● | ● | ● | when & what & how |
Kinds explained:
- zero: no signal (proves non-existence)
- first: unknown signal (proves existence)
- second: known signal (proves particular existence)
- third: full-known signal (proves existence at particular time)