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On the occasions of the previous International Field Measurements in Geomechanics (FMGM) symposia in Boston 2007 and Berlin 2011, contributions were made on the issue of developing a set of international geotechnical monitoring standards. Efforts, initially undertaken under the auspices of DIN, the German Standardisation Organization (Bock & Thaher 2007), and subsequently of CEN, the European Standardisation Organization (Steiner 2011) were referred to. This paper presents an update on the process, covering the developments, which have taken place since 2011, the current state, and future perspectives. It is foreseen that the set of the international geotechnical monitoring standards will consist of ten parts. Currently, the committee work is carried out by the authors of this paper, under the auspices of CEN, in cooperation with the International Standardization Organization (ISO). In 2013 it was decided to label the new standards as EN ISO 18674 under the heading of 'Geotechnical investigation and testing-Geotechnical monitoring by field instrumentation'. Since 2011, the first part, namely 'General rules', has been finalised and is expected to be published in 2015. Drafts for the following two parts are nearing completion:

The redevelopment of King's Cross Station in central London includes the construction of a new Northern Ticket Hall and tunnelled connections to existing infrastructure. These works are to be carried out beneath a congested site including Grade I and II listed buildings, and heavy rail and road traffic both above and below ground (three London Underground lines). Arup and Soldata were required to design and implement a monitoring solution that would assist with the management of the risks. A direct and unique contract from the client to the instrumentation specialist was set up in order to keep a tight control on the data quality, and to ensure an optimal distribution of the results. A real-time system, based on an automated total station network combined with standard monitoring methods (inclinometers, precise levelling, etc.), was chosen. The detailed design and optimisation of such a system involves estimating the precision based on site-specific information. Since installation on site, the site monitoring data have shown the adequacy of the design, with the estimated field precision easily attained, and in some cases well exceeded. The main conclusion is that, with adequate care, the design and implementation of a large monitoring system can lead to fruitful results that are reliable, rapid and accurate.

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