© 2017 19th ICSMGE Secretariat. All rights reserved. This paper introduces the new holistic Observational Method (OM) framework described in Ciria C760 -the new revision to the Embedded Retaining Wall Design Guide. This new OM framework is described by four approaches and these are explained with reference to case histories. Maximum benefit is achieved by back analyzing case histories in similar ground conditions to derive the most probable soil parameters. These parameters can then be used in an ab initio design to maximize saving in the wall thickness, toe embedment, and propping forces. A contingency plan is based on conventional characteristic design parameters and this involves additional propping. The term ipso tempore is introduced to cover wall redesign after construction starts. This may be to achieve saving in propping where movements are smaller than predicted. Alternatively, additional propping or ground treatment may be required and this is consistent with Peck's 'best way out' approach.