Table of contents Chapter 1. General Introduction 9 Young people with a mild intellectual disability 10 Studying change 21 My own change towards this PhD 30 Chapter 2. The effectiveness of Take it Personal! on substance use 35 Chapter 3. Behavioral problems in Take it Personal! 53 Chapter 4. The feasibility of daily monitoring 73 Chapter 5. Idiographic personality networks 97 Chapter 6. Case study challenging behavior 125 Chapter 7. General Discussion 153 Summary of main findings 154 Discussion of findings 155 Epilogue: who have I studied? 172 Appendices 183 Appendix A: Supplement material for Chapter 2 184 Appendix B: Supplement material for Chapter 3 185 Appendix C: Supplement material for Chapter 5 186 Appendix D: Supplement material for Chapter 6 189 Appendix E: Supplement material for Chapter 6 190 References 191 Dutch summary (Nederlandse samenvatting) 208 List of publications 212 Research data management 214 About the author 216 Dankwoord (acknowledgments) 218
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