Modular building standard

A modular building standard is a set of guidelines allowing multiple builders to join models together in a larger display, usually at a public event such as a train show or Fest. Modular building standards have been created both by LEGO itself (ie. Modular Houses) and by fans (ie. Classic Castle City standard).

Advantages

One of the main advantages of modular building standards is that several AFOLs with collections of widely varying sizes can all contribute to make a city, landscape or battle scene of enormous size.

Limitations

Each standard imposes restrictions of one kind or another to allow for connections of one MOC to another to create a seamless (or nearly seamless) whole.