// holds ALL upload models
    this.collection     = new ncs.collection.UploadCollection();
    
    
    // subset of archived models
    this.archiveCollection  = new Backbone.Subset({
                  superset: this.collection,
                  filter: function(upload) {
                    return (upload.hasFailed() || upload.isComplete());
                  }
                });
            
    // subset of active models
    this.activeCollection = new Backbone.Subset({
                  superset: this.collection,
                  filter: function(upload) {
                    return (upload.isQueued() || upload.isUploading());
                  }             
    });
    
    // subset of queued models
    this.queuedCollection = new Backbone.Subset({
                  debug: 'queued',
                  superset: this.collection,
                  filter: function(upload) {
                    return upload.isQueued();
                  }             
    });

    // subset of active models
    this.uploadingCollection  = new Backbone.Subset({
                    debug: 'uploading',
                    superset: this.collection,
                    filter: function(upload) {
                      return upload.isUploading();
                  }             
    });