Several metrics are available in each sector you mention. To gauge the financial health of a prospective partner, I would look at product sales growth or I might look at whether they have met their milestones. To gauge strategic health, I would consider their market share growth or how well their customers have access to the company.
For operational health, I would again look to see whether they have met their milestones, how well they make decisions as gauged by the rating we give them and how quickly they resolve conflicts. Good evaluations in these areas suggest that the prospective alliance will be viable for both parties.   _{Your Comment}