The Wellsite Information Transfer Specification (WITS) is a specification for the transfer of drilling rig-related data. This petroleum industry standard is recognized by a number of companies internationally and is supported by many hardware devices and software applications. WITS is a multi-layered specification: Layer 0 describes an ASCII-based transfer specification Layer 1 describes a binary-based format based on 25 predefined fixed-size records and the Log Information Standard (LIS) data-transmission specification Layer 2 describes bidirectional communication using LIS Comment records Layer 2b describes buffering of data Layer 4 extends the previous layers to use a different data exchange format, RP66 Though still in active use as of 2013, the specification has been superseded by the XML-based WITSML. See also Wellsite information transfer standard markup language Drilling technology Petroleum technology