The following is an excerpt from the report of the Windsor Continuation Group.  One can view the entire report at the link below or download a PDF.

To be a communion, as opposed to a federation or association, is fundamentally to acknowledge that the fellowship of Churches is not a human construct; it is the gracious gift of God. Churches are enabled to live in communion because they recognise one another as truly an expression of the One Church of Jesus Christ. If mutual recognition of faithful discipleship, the preaching of the Word of God or the ordered administration of the Sacraments is threatened, then the entire foundation of the Communion is undermined. This is why although Anglicans remain committed to a generous accommodation of diversity, there must ultimately be some limit to the extent of the diversity which can be embraced. This limit is the point where the fellowship of Churches can no longer recognise in one of its members the faithfulness to Christ which flows from communion with the Father, in the Son, through the power of the Holy Spirit. If the recognition of one another as Churches is to be sustained, it implies a level of mutual accountability in the handling of the life of each Church.

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That excerpt is remarkably well put and needs careful reading.