The closed loop pole positions of a linear, multivariable system with unity rank output feedback are examined as a scalar feedback gain varies. In particular, consideration of the terminal locations of the poles as the gain increases indefinitely leads to a minor modification of a well known pole placement algorithm, resulting in a dyadic output feedback algorithm for zero assignment. This allows the designer to manipulate the root loci directly, and a consequence of the unity rank feedback is that the root loci of the multivariable system can be analysed in terms of a classical, scalar root locus diagram. The technique can be used to provide an improved ‘ point of departure ’ for the design of gain injecting compensators.