1. Building Dependable Systems

2. R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. Ambiguous Incomplete Inconsistent Complex Defect Removal Formalisation Control of Complexity Behavior Trees Integrated Behavior Tree Simulation Model Checking Implementation Informal Requirements Integration

3. Informal Requirements Integrated Behavior Tree Requirements Integration Requirement Behavior Trees Informal Requirements Requirements Translation Simulation Verification R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Component Behavior Tree Implementation

4. Component Behavior Tree Implementation Informal Requirements Integrated Behavior Tree Requirements Integration Requirement Behavior Trees Requirements Translation Simulation Verification R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Requirements Translation

5. Informal Requirements Integrated Behavior Tree Requirements Integration Requirement Behavior Trees Requirements Translation Simulation Verification R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Requirement Behavior Tree Component Behavior Tree Implementation

6. Component Behavior Tree Implementation Informal Requirements Integrated Behavior Tree Requirements Integration Requirement Behavior Trees Requirements Translation Simulation Verification R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Requirements Integration

7. Informal Requirements Integrated Behavior Tree Requirements Integration Requirement Behavior Trees Requirements Translation Simulation Verification R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Integrated Behavior Tree Component Behavior Tree Implementation

8. Informal Requirements Integrated Behavior Tree Requirements Integration Requirement Behavior Trees Requirements Translation Simulation Verification R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Component Behavior Tree Implementation

9. Informal Requirements Integrated Behavior Tree Requirement Behavior Trees Requirements Translation Simulation Verification R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Requirements Integration Simulation Component Behavior Tree Implementation

10. Informal Requirements Integrated Behavior Tree Requirements Integration Requirement Behavior Trees Requirements Translation Simulation Verification R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Verification Component Behavior Tree Implementation

11. Automatically Generated Implementation Informal Requirements Integrated Behavior Tree Requirements Translation Simulation Verification Component Behavior Tree R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Implementation

12. Informal Requirements Integrated Behavior Tree Requirement Behavior Trees Requirements Translation Simulation Verification Component Behavior Tree R1. There is a single control button available for the user of the oven. If the oven is idle with the door closed and you push the button, the oven will start cooking (this is, energize the power-tube for one minute). R2. If the button is pushed while the oven is cooking it will cause the oven to cook for an extra minute. R3. Pushing the button when the door is open has no effect (because it is disabled). R4. Whenever the oven is cooking or the door is open the light in the oven will be on. R5. Opening the door stops the cooking. R6. Closing the door turns off the light. This is the normal idle state, prior to cooking when the user has placed food in the oven. R7. If the oven times-out, the light and the power-tube are turned off and then a beeper emits a sound to indicate that the cooking is finished. Requirements Integration Building Dependable Systems Implementation

13. Building Dependable Systems 1. Control of Complexity Avoids short-term memory overflow 2. Early Defect Detection Quality, verified software 3. Rigorous Translation Building right system, right 4. Ease of Simulation, Model checking Dependable systems 5. Productivity gains for teams Parallel working, Co-operative editing 6. Wide applicability Command and Control, Enterprise Systems