Low scale integration is a simple way from making a single transistor to putting several transistors on the same chip and linking them into straightforward circuit modules. The fact that the transistors are all on the same chip implies that their characteristics (e.g. gain) are the same. This removes the requirement of match transistors while building a circuit from various individual devices.
The very simple CMOS logic ICs are representative examples of LSI. The figure shown below is the circuit of an inverter.
