At the beginning of the last quarter of 1992 I went to Mt Wilson for two 
weeks in order to observe with the MKIII interferometer. The weather and 
seeing conditions were generally good. After returning from Mt Wilson I 
continued to work on the paper of the spectroscopic binary Eta 
Andromedae but soon found out that it was necessary to look for an 
independent method to estimate the uncertainties of the model parameters 
(so far, we used formal estimates derived from the non-linear least 
squares fitting routine). I wrote a "Monte Carlo" program which 
simulates data and fits models to the data, so that we can hope to get a 
realistic estimate for parameter uncertainties by looking at the scatter 
of the parameters among the various models, provided that the simulation 
scheme produces "realistic" data. I tested this program only on Eta 
Andromedae so far: it seems to confirm the results from the formal 
estimation. Since the results of our orbit determinations will directly 
be compared to stellar evolution theory, we need to have reliable 
estimates of the uncertainties of our model parameters. 
On the 17th of November I left again for Mt Wilson; weather and seeing 
conditions were mediocre and not much data was collected during the two 
weeks. I increased the total number of binary orbits determined from the 
MKIII observations to 26 (2 orbits require the use of additional speckle 
data).
In preparation of the Sydney IAU conference on "Very High Angular 
Resolution Imaging" in January I updated the binary data reduction. I 
prepared a poster displaying all orbits and also a poster on the results 
of the astrometry data reduction. I also completed the two 
corresponding papers to appear in the proceedings.