Miniaturisation has been associated with development because it's miniaturisation that has allowed computer chips to develop into more powerful processors. The combination of smaller less powerful chips can be harnessed on a single chip, so small it could fit onto a fingertip.

Micro Processor Technology

Until the 1960s computers were nothing more than transistors. It was in the 60s that these transistors were replaced with tiny transistors and other electrical components arranged on a single chip of silicon. Integrated circuits became miniaturised, enabling more components to be designed into a single computer circuit. In the 1970s refinements in integrated circuit technology led to the development of the modern microprocessor, integrated circuits that contained thousands of transistors. Modern microprocessors contain as many as 10 million transistors.

This is the UNIVAC computer system. It is an example of the size of early computers. As you can see whole systems would take up a whole room.

What Miniaturisation has done

Miniaturisation has increased the capability and reliability of microprocessors but at the same time it has reduced the chip's power consumption. An example would be the performance of logical and arithmetic functions on a single microprocessor. Such a task would have been done on separate components before miniaturisation demanding more power and space.