1 Introduction.- 2 A major transformation at a global insurance company.- 3 Centralised monitoring of pensions in Greece.- 4 Enterprise coherence in the public sector.- 5 Public services opening up to innovation.- 6 Degrees of change in enterprises.- 7 Enterprise transformation from a social perspective.- 8 More than engineering; The role of subcultures.- 9 The need for a use perspective on architectural coordination.- 10 Involving the right stakeholders - Enterprise coherence governance.- 11 Information requirements for enterprise transformation.- 12 Institutionalisation of ACET - Needs and foundations.- 13 The need for model engineering.- 14 Steering transformations with architecture principles.- 15 The need for explicit decision-making strategies.- 16 ACET constructs.- 17 Transformation intelligence capability catalogue.- 18 Coherence management dashboard for ACET.- 19 Guidelines for architecture models as boundary objects.- 20 The ACET information requirements reference model.- 21 Model Componential language engineering.- 22 Principle-based goal-oriented requirements language.- 23 The EA Anamnesis approach.- 24 Formalising enterprise architecture decision models.- 25 Situational adaptations of ACET.- 26 Conclusion and reflections.