I'm not sure which ui file to refer to. Mainwindow has a ui file, but dataModel is just a class containing functions without GUI elements. updateProjectData() is a function belonging to the dataModel class, but I can't get access to that function because I think I'm not passing the right pointer. Hence the error regarding QObject::updateProjectData(QTreeWidgetItem*) not existing.
I think it should be dataModel::updateProjectData(QTreeWidgetItem*) instead of QObject::updateProjectData(QTreeWidgetItem*).

Can you please post the full signature for the dataModel::updateProjectData function? Also, make sure the slot is declared public, by default they are private.

Of course, datamodel.cpp

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void dataModel::updateProjectData(QTreeWidgetItem* item)
 {
 }

It's declared as a public slot in datamodel.h:

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class dataModel : public QObject
{

  public:
    dataModel(QObject* parent, MainWindow* mainWindow);
 
  public slots:
    void updateProjectData(QTreeWidgetItem* item);
};

Can you please add Q_OBJECT above "public:" in your header? Otherwise the Meta Object Compiler won't be run on your files.

That makes sense, but I get two nasty errors when compiling:

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Tool:0: "dataModel::staticMetaObject", referenced from:
Tool:0: symbol(s) not found
Tool:0: __ZTV10dataKernel$non_lazy_ptr in datamodel.o

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Tool:0: "vtable for dataModel", referenced from:
Tool:0: __ZN10dataModel16staticMetaObjectE$non_lazy_ptr in datamodel.o

What are you using for your build system?
- If it is QMake, you may need to re run it ( qmake ) to regenerate the Makefile.
- If it is CMake, could you please post CMakeLists.txt

I'm developing this in Xcode on OS X, so my guess I'm using neither at the moment. I ran qmake from the commandline which sorted things out. Everything builds now! Warnings about slots have also vanished, all because I didn't include the Q_OBJECT macro... :-$

Thanks again!