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1 INTRODUCTION

1.1 Purpose of this Manual

1.1.1 The Manual on WIS is designed to ensure adequate uniformity and standardization in the data, information, and communications practices, procedures and specifications employed among WMO Members in the operation of WIS as it supports the mission of WMO. The Manual on WIS sets out standard practices, procedures and specifications (distinguished by the term "shall") having the status of requirements in a technical resolution, which it is necessary that WMO Members follow or implement. The Manual on WIS also sets out recommended practices, procedures and specifications (distinguished by the term "should") which Members are urged to comply with.

1.1.2 The Manual on WIS is Annex VII to the Technical Regulations (WMO No. 49), Volume I (General meteorological standards and recommended practices), where it is stated that WIS is established and operated in accordance with practices, procedures and specifications in the Manual on WIS.

1.1.3 Because WIS cross cuts all WMO related discipline areas, many other WMO practices, procedures and specifications intersect WIS. Such practices, procedures and specifications are primarily defined in their specific publications, for example, the Manual on Global Data Processing and Forecast System (WMO No. 485), and the Manual on Global Observing Systems (WMO No. 488), among others.