Now look at suggested modifications for the original unit. (ascd.org)
The impasse was broken following suggested modifications of both text and diagram provided by the representatives of the USA. (theguardian.com)
I will argue that theoretical models, such as the «billard ball model» of a gas, are not merely convenient calculating devices or temporary psychological aids in the formulation of theories; they have an important continuing role in suggesting both modifications in existing theories and the discovery of new phenomena. (religion-online.org)