The full-background-extender Kc -construction of  has the property that, if it does not break down and produces a final model , then
Ή is Woodin in V ⇒ Ή is Woodin in ,
for all Ή. It is natural to ask whether
κ is strong in V ⇒ κ is λ-strong in ,
for all κ, or even better,
κ is λ-strong in V ⇒ κ is λ-strong in .
As one might suspect, the more useful answer would be “yes”.
For the Kc-construction of , this question is open. The problem is that the construction of  is not local: because of the full-background-extender demand, it may produce mice projecting to ρ at stages much greater than ρ. Because of this, there is no reason to believe that if E is a λ-strong extender of V, then The natural proof only gives that if κ is Σ2-strong, then Σ, is strong in .
We do not know how to get started on this question, and suspect that in fact strong cardinals in V may fail to be strong in , if is the output of the construction of . Therefore, we shall look for a modification of the construction of . One might ask for a construction with output such that
(1) iteration trees on can be lifted to iteration trees on V,
(2) ∀δ(δ is Woodin ⇒ δ is Woodin in ), and
(3) (a) ↾κ(κ is a strong cardinal ⇒ κ is strong in ), and (b) ↾κ↾λ(Lim(λ) Λ κ is λ-strong ⇒ κ is λ-strong in ).