In order to encourage effective coordination, you first need to assess the situation: what activities are currently going on? Who is implementing them? Are there any coordination mechanisms- formal or informal- in place? If yes, who is the lead? Understanding the ground realities will enable you to better identify the type of coordination mechanism that is required and determine how it can be implemented.
Once you have mapped out all the relevant actors, you should also aim at identifying the interdependencies between them and your own programmes. The multiplicity of actors and at times, the lack of clarity on their mandates and activities, will make it difficult to see the links between various programmes. Highlighting these interdependencies could encourage those concerned to coordinate with each other, exchange good practices and lessons identified, avoid duplication and identify potential partners and resources.