My take (strictly hypothetical), from here.

Strikes (whether drone or other air, or boots on the ground direct actions) can be divided into two catagories, depending on what is known and unknown re: the target.

A "personality strike" is one targeting an individual whose identity and past and current activities are known. When the strike is conducted, those making the decision to engage are primarily concerned with (1) the degree of confidence that the particular individual is present; and (2) the extent of collateral damage that can be tolerated. UBL and al-Awlaki, for example.

A "signature strike" is one targeting an individual (or individuals) whose precise identity is (precise identities are) unknown or uncertain. Instead, the individual or individuals must match a pre-identified “signature” (a behavior set) that the targeter links to terrorist activity or association.

I expect we'll be hearing much more about "signature strikes".

The signature strike matrix below is strictly hypothetical (presented as a quote only to set it off):

A Signature Strike Matrix

(1) Individual(s) Planning Attacks

(2) Individual(s) Transporting Weapons (not incl. legal weapons ?)

(3) Individual(s) Handling Explosives

(4) Individual(s) in Terrorist Compound

(5) Individual(s) in Terrorist Training Camp

(6) Military-Age Male(s) in Known Terrorist Activity Area

(7) Individual(s) Consorting with Known Militants

(8) Armed Man(Men) Traveling (on foot)(in vehicles) in Terrorist-Controlled Area

(9) Individual(s) in Suspicious Camp located in Terrorist-Controlled Area

(10) Group(s) of Armed Men Traveling Toward Conflict Area

(11) Individual(s) Operating a Terrorist Training Camp

(12) Individual(s) Training to Join a Terrorist Group

(13) Individual(s) Facilitating a Terrorist Group

(14) Individual(s) in Terrorist Rest Facilities (Safe Houses)
Discuss, if you wish, the plusses and minuses of the matrix as written

- as well as

(1) the test you would use to include a factor (e.g., "more likely than not", "reasonable certainty", "high degree of confidence", etc., etc.);

(2) whether you would include or exclude each factor separately without considering the other factors (strict "must stand on its own" test); or would you aggregate all factors supported by some evidence, even where each such factor would not "stand on its own" ("conditional probability"); and

(3) whether other factors should be added to the matrix.

This doesn't require legalese.

Regards

Mike