The authors study the oscillation and asymptotic behaviour of solutions of second order neutral delay differential equations. They first consider the equation
where such that , , , , and . The authors derive certain sufficient conditions for every solution of the above differential equation to be oscillatory or tending to zero. Finally, they consider the non-homogeneous form of the above equation, where zero on the right hand side is replaced by a function and find necessary conditions for every solution of this equation to be oscillatory or tending to zero.