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Quantum computing is an emerging technology that is touted to be a solution to many of the real-world problems that are computationally difficult or impossible for modern computers. There are many different implementations of said quantum computers, with gate-defined quantum dots in silicon metal-oxide-semiconductor devices as one of the platforms at the forefront. For a quantum computer to work, it needs to achieve fault-tolerance and one of the key ingredients in achieving that is having long-range coupling in a scalable architecture. Long-range coupling enables improved connectivity and also reduces challenges in fabrication and architecture design. To that end, I investigate three different methods of achieving this long-range coupling. The first is a bucket-brigade style of shuttling qubits across a chain of dots, the second is using a multi-electron quantum dot to mediate exchange interactions between neighbouring dots, and the final method is utilising a superconducting microwave resonator to mediate spin-photon interactions over long distances. Each of these methods presents its own advantages and challenges which we evaluate in this thesis. Having gained knowledge about these methods, we discuss how we can incorporate them into a scalable architecture.