Greiner Five Phases of growth

Greiner's Growth Curve is accurate
Charlie, USA
This model is amazingly accurate in terms of growth stages and the change drivers that trigger decisions for companies and organizations, particularly since it was developed in the early 1970's. My experience is that organizations encounter thresholds during growth that require changes in management models to successfully pass through, like a shift from "family-managed" to "professionally-managed". Of interest to me is how to retain the drive and creativity of Start-ups as a company grows. I've seen this happen in larger companies and attribute most of it to enlightened leadership that breaks down silos and encourages certain amounts of risk-taking.

Growth in Delegation and Coordination Phases
Dr.P.L.Narasimhan, India
The growth in steps 3 & 4 - delegation, coordination and direction will be flat and horizontal since the efforts will be to concentrate on maintaining the efficiency in the growth stage when the organization becomes big.

End in crisis
Francis Lenne, France
After the 6th step, we now can add: "Ending by a “failure in ethics and confidence” crisis, needing a public management solution." ... Come back to basic.

Greiner 6 phases
Frances, USA
You should know throughout the course of the implementation or process of the phases whether or not a business is working or if you have the right stakeholders for the company/business to gel without having to wait for the failure. I would panic if we had "failed ethics or confidence" as Francis mentioned. I would stop and measure the progress along the way.....

Delegation and Coordination Phases
Kevin Thuo, Student (MBA), Kenya
These two phases do provide for periodical reviews before any major decision making.. Of course this brings with it red-taping where procedures might take precedence over problem solving but "red taping" could be kept at a minimum with proper organizational structuring since it is a necessary control measure necessitated by growth...
Also, I believe that crises are the most effective motivators for change and not just in organizations but as a human phenomenon... This is true whether the crises actually happen or are well anticipated by management and avoided...
I do agree that the model could end up as a cycle at some point since we are yet to establish the possibility of an organization (business) to exist in perpetuity...