Quote from page 2 of "Anagtomy of a Shadowrun"
Matrix Overwatch
With the description Riser provided, Ladybug, their team technomancer who is accompanying them in VR, tries to locate the target’s AR profile. She knows this will take time given the location and the crowds. She decides to augment her Scan through threading. In hot sim VR she receives a +2 modifier to all her Matrix tests; so she rolls Software 3 (Threading +2) + Resonance 5 with +2 modifiers for a total of 12 dice. She scores 2 hits.
Why, in the above quote, is Threading "+2"? I get Software 3 (it's her rating in software), Resonance 5 (her rating in Resonance), and +2 modifiers (her hot him "+2"), but i don't get "Threading +2". Threading is an "act", not a skill or attribute, so how does it get a rating at all!?