  In this paper we construct `inter-class orthogonal' main effect plans (MEP)
for asymmetrical experiments. In such a plan, a factor is orthogonal to all
others except possibly the ones in its own class. We have also defined the
concept of "partial orthogonality" between a pair of factors. In many of our
plans, "partial orthogonality" has been achieved when (total) orthogonality is
not possible due to divisibility or any other restriction.
  We present a method of obtaining `inter-class orthogonal' MEPs. Using this
method and also a method of `cut and paste' we have obtained several series of
`inter-class orthogonal' MEPs. Interestingly some of these happen to be
orthogonal MEP (OMEP), for example we have constructed an OMEP for a $3^{30}$
experiment on 64 runs. Further, many of the `inter-class orthogonal' MEPs are
`almost orthogonal' in the sense that each factor is orthogonal to all others
except possibly one. In many of the other MEPs factors are "orthogonal through
another factor", thus leading to simplification in the analysis. Plans of small
size ($\leq 15$ runs) are also constructed by ad-hoc methods.
  Finally, we present a user-friendly computational method for analysing data
obtained from any general factorial design.
