| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Attention Deficit Hyperactivity Disorder |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| being hyperactive and/or inattentive |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Nervous System Diseases [C10] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 18.0 |  
| E.1.2 | Level | LLT |  
| E.1.2 | Classification code | 10003735 |  
| E.1.2 | Term | Attention deficit-hyperactivity disorder |  
| E.1.2 | System Organ Class | 100000004873 |  | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| The purpose of this study is to evaluate the safety and efficacy of Osmotic Release Oral System (OROS) methylphenidate in participants with Attention Deficit Hyperactivity Disorder (ADHD). |  | 
| E.2.2 | Secondary objectives of the trial |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| - Participants voluntarily provided informed consent to participate in the study - Participants with written informed consent to participate in the study voluntarily by caregivers/legal representatives
 - Participants who were capable to follow the study visit schedule well and their parents/caregivers who were willing to complete the assessments specified in the protocol and were capable to complete them
 - Participant and his/her parent/guardian able to understand the study participation and to request withdrawal from the study voluntarily at any time
 - Participants who were satisfied in diagnosis of Diagnostic and Statistical Manual of Mental Disorders Fourth Edition (DSM-IV) Attention Deficit Hyperactivity Disorder (ADHD) and determined to require drug therapy
 |  | 
| E.4 | Principal exclusion criteria | 
| - Participants who have known hypersensitivity (altered reactivity to an antigen, which can result in pathologic reactions upon subsequent exposure to that particular antigen) to methylphenidate HCL - Participants who have significant suicidal ideation
 - Participants with mental retardation
 - Participants who meet DSM-IV diagnostic criteria for current major depressive disorder or anxiety disorder requiring drug therapy
 - Participants who have abnormalities in the Electrocardiography (ECG) or show clinically significant abnormalities of laboratory results, including serum chemistries and hematology
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| - Change From Baseline in Korean Version of the Attention-Deficit Hyperactivity Disorder (K-ADHD) Rating Scale (K-ARS) Total Score at Week 12 - Number of Participants With Response Based on K-ARS Total Score at Week 12
 - Number of Participants With Remission Based on K-ARS Total Score and Clinical Global Impression – Improvement (CGI-I) Scale Score at Week 12
 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| - Baseline and/or Week 12 
 |  | 
| E.5.2 | Secondary end point(s) | 
| - Change From Baseline in Child Health and Illness Profile-Child Edition (CHIP) Total Score and 5 Sub-domains Score at Week 12 - Change From Baseline in Visual Selective Attention Subtest of Comprehensive Attention Test (CAT) Total Score at Week 12
 - Change From Baseline in Auditory Selective Attention Subtest of Comprehensive Attention Test (CAT) Total Score at Week 12
 - Change From Baseline in Inhibition-Sustained Attention Subtest of Comprehensive Attention Test (CAT) Total Score at Week 12
 - Change From Baseline in Interference-Selective Attention Subtest of Comprehensive Attention Test (CAT) Total Score at Week 12
 - Change From Baseline in Divided Attention Subtest of Comprehensive Attention Test (CAT) at Week 12
 - Change From Baseline in Working Memory Forward Subtest of Comprehensive Attention Test (CAT) at Week 12
 - Change From Baseline in Working Memory Backward Subtest of Comprehensive Attention Test (CAT) at Week 12
 -  Change From Baseline in Academic Performance Rating Scale (APRS) Score at Week 12
 - Change From Baseline in Beck Depression Inventory (BDI) Score at Week 12
 - Change From Baseline in Parenting Stress Index (PSI) Total Score at Week 12
 - Change From Baseline in Clinical Global Impression-severity (CGI-S) Score at Week 12
 - Clinical Global Impression - Improvement (CGI-I) Scale Score at Week 12
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| - Baseline and/or Week 12 |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | Yes | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | No | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | Yes | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | No | 
| E.8.1.1 | Randomised | No | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 1 | 
| E.8.3 | Will this trial be conducted at a single site globally? | No | 
| E.8.4 | Will this trial be conducted at multiple sites globally? | Yes | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | Yes | 
| E.8.6.3 | Specify the countries outside of the EEA in which trial sites are planned |  | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.2 | In all countries concerned by the trial months | 11 |