You've rolled out that development programme, spent the last two years endeavouring to shift your culture, implemented that new sytem, radically overhauled your work place design. But have you actually achieved what you set out to achieve in the first place? What has worked well? What's gotten in the way? Where did you show real courage and stick with it, and where were the risks simply too great?
Reviewing a programme against your initial objectives is an essential part of any transformational exercise. Change is bound to be iterative and it's only by reflecting on how things have been done, what's been achieved, and what's still to be done can you objectively identify your next steps.
Undertaking some independent, objective evaluation is the most effective way of building this understanding.