  We construct logarithmic conformal field theories starting from an ordinary
conformal field theory -- with a chiral algebra C and the corresponding space
of states V -- via a two-step construction: i) deforming the chiral algebra
representation on V\tensor End K[[z,1/z]], where K is an auxiliary
finite-dimensional vector space, and ii) extending C by operators corresponding
to the endomorphisms End K. For K=C^2, with End K being the two-dimensional
Clifford algebra, our construction results in extending C by an operator that
can be thought of as \partial^{-1}E, where \oint E is a fermionic screening.
This covers the (2,p) Virasoro minimal models as well as the sl(2) WZW theory.
