Chemicals management is a diverse field, spanning issues of public health, environmental protection, economics, industry, agriculture, worker protection, international relations, and trade. Governmental actors involved in chemicals management often operate on a sectoral basis (e.g. under their own, separate legislation) and thus may not be accustomed to working and sharing information. In addition, several orders of government, e.g. federal, provincial, and local governments, also typically share responsibilities (though often without formal collaboration) for the implementation of chemicals management programmes, laws, and policies.
Effective coordination among the whole range of those who have responsibility for or a stake in chemicals issues means that all those involved are familiar with each others’ main chemicals-related activities, priorities, and positions, and the underlying reasons for each. This coordination of information will allow to make better quality and more strategic decisions on chemicals issues.
In addition, as chemicals play a part in nearly all aspects of modern life, many stakeholders in society have an interest in, and are potentially affected by, the way in which chemicals are managed and used. The support and engagement of those stakeholders is often critical for the successful implementation of chemicals management strategies and initiatives.
Guidance documents
UNITAR: Guidance for Developing SAICM Implementation Plans [2009] English 
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Section 4.1 covers coordination issues and has one example from Panama. Box 11 on partnership projects in Tanzania could also be useful.
UNITAR: Interministerial Coordination for Sound Chemicals Management, Guidance Note [2001] English
Addresses coordination and includes some examples.