摘要：A simple, first answer to the question posed in this debate is ¡°in some
circumstances¡±. It would clearly be wrong to cast the Theory of Planned
Behaviour as a single model for human fertility, which has many facets, not the
least of them biological. The question I want to address, then, is not if the Theory
of Planned Behaviour (TPB) is an appropriate model, but when is it an
appropriate model for human fertility? I will begin by concentrating on that
question, then address a number of issues about using the TPB in practice that
follow both from the when and from the critique raised by Morgan and Bachrach
(2011). In particular, I will consider issues that arise in the operationalisation of
the model, how time can be incorporated in both static and dynamic models using
the TPB, and how the influences of macro-level events and conditions can be
modelled as effects on the components of the TPB.
