Many thanks for the comments received. Rightly say, OD is not a tool to solve problems, yet improving and developing factor that could solve problems in the middle. using Richard Beckhard definition "OD is a planned effort, organization wide, managed from top to increase organization effectiveness and health through planned interventions in org process, using behavioral science knowledge".
So several symptoms in the organization at corporate level that could call for improvement. Examples are (1) decrease in morale and motivation (2) increase in attrition rate (3) inappropriate safety behavior (4) appearant communication gap (5) ineffective team work (6) lack of innovation atmosphere. Sure while considering OD, there will be a need to use several tools from the start when diagnosing the problem upto setting the strategy for implementation. Principles and approaches such as root-cause, behavioral science, change management, TQM are tools that will become inevitable and will form part of the process.
Thanks again for sharing the knwoledge.