, specifically the Variational Quantum
Monte Carlo technique (VMC) and the choice of trial wavefunction used in
VMC. Attention is drawn to the limitations of the technique
such as the restrictions on the choice of the variational trial
wavefunction due to the cusp condition and the problem of the fixed
nodal surface of the wavefunction. Some of these problems also relate
to the Diffusion Quantum Monte Carlo (DMC) technique which is also briefly
introduced.