the OD interventions can be in any and all areas / functions or deppts. of an organisation where things are required to be overhauled.
for e.g
HR OD interventions will include Performance appraisals, Performance managment systems, forms, etc. competency mapping in specific functionary departments or across the departments like engg., IT, Fin, etc. Training needs assessment, process improvement study, etc.
the above are some OD interventions that the respective companies undergo with the help of expert consultants.
i hope this should help you.
regards
S.P Tripathi
NPC India