The following are summaries of some of the attempts to look for theories which might help explain how psi operates. These are written for a non-technical audience - interested parties should look at the references provided for a better idea of the specifics.

Teleological Model of Psi
Quantum Mechanical Theory of Psi
Thermal Fluctuation Model
The Model of Pragmatic Information
Psi Mediated Instrumental Response (PMIR) & Conformance Behaviour Model
Decision Augmentation Theory (DAT)
Electromagnetic Theories