Roles & Personas¶
Roles represent the abstract classes representing human agents; these also encapsulate behaviours and responsibilities. CAIRIS supports 2 types of role: stakeholder and attacker. Stakeholder roles represent human agents the system needs to be directly, or indirectly designed for. Attackers are human agents the system should not be designed for.
Adding, updating, and deleting a role¶
- Select the Risk/Roles menu to open the Roles table, and click on the Add button to open the Role form.
- Enter a role name and description, and select the role type.
- Click on the Create button to Add the new role to the CAIRIS database.
- As responses and countermeasures are assigned to roles, the Role form is automatically updated to reflect these new dependencies. These dependencies can not be modified from the Role dialog.
- Existing roles can be modified by clicking on the role in the roles table, making the necessary changes, and clicking on the Update button.
- To delete a role, select the role to delete in the roles table, If any artifacts are dependent on this role then a dialog box stating these dependencies are displayed. The user has the option of selecting Yes to remove the role dependencies and the role itself, or No to cancel the deletion.
Responsibility models can be viewed by selecting the Models/Responsibility menu option and selecting the environment to view the environment for.
By changing the environment name in the environment combo box, the responsibility model for a different environment can be viewed. By clicking on a model element, information about that artifact can be viewed.
For details on how to print models as SVG files, see the `Viewing Asset models`_ section.
Personas are specifications of archetypical users that the system needs to directly or indirectly cater for. The system needs to be specified for Primary Personas, but Secondary Personas cannot be ignored as their thoughts or concerns provide insight into potential usability problems.
Adding, updating, or deleting a persona¶
- Select the UX/Personas menu to open the table of personas, and click on the Add button to open the new Persona form.
- Enter a persona name and select the persona type.
- If the persona is not derived from empirical data, then select the Asssumption Persona check-box. Ticking this box has the effect of pre-fixing the persona name with the << assumption >> stereotype in any models where the persona is present.
- Click on the Activities tab and enter the activities carried out by the personas.
- Click on the Attitudes tab and enter the attitudes held by the persona, with respect to the problem domain the system will be situated in.
- Click on the Aptitudes tab and enter the persona’s aptitudes, with respect to the problem domain the system will be situated in.
- Click on the Motivations tab and enter the persona’s personal motivations.
- Click on the Skills tab and enter the persona’s skill-set, with respect to the problem domain the system will be situated in.
- Click on the Contextual Trust tab, and enter information about aspects of this persona with an impact on contextual trust warranting properties.
- Click on the Contextual Trust tab, and enter information about aspects of this persona with an impact on intrinsic trust warranting properties.
- If you have decided to personalise the persona with a picture, this can be added by clicking on avatar box next to the persona properties notebook, to select an image to associated with the persona.
- Click on the Environment table, and choose and environment to situate the persona in. This will add the new environment to the environment list, and open up a new folder for information about persona roles, and an environment specific narrative.
- After ensuring the environment is selected in the environment window, click on the Roles tab. Select the Direct Persona check-box if the persona is a direct stakeholder with respect to the system being defined, and add roles fulfilled by the persona in the Roles list-box. These roles can be added by clicking on the add button in the role table, or deleted by clicking on the button next to the role to be removed.
- Click on the Narrative tab and enter a narrative describing the persona’s relationship with the problem domain or prospective system within the environment, and any environment specific concerns he or she might have.
- Click on the Create button to add the new persona.
- Existing personas can be modified by clicking on the persona in the Personas table, making the necessary changes, and clicking on the Update button.
- To delete a persona, click on the delete button next to persona to be removed in the personas table. If any artifacts are dependent on this persona then a dialog box stating these dependencies are displayed. The user has the option of selecting Yes to remove the persona dependencies and the persona itself, or No to cancel the deletion.
Recording persona assumptions¶
- Select the UX/External Documents menu, and click on the Add button to add information about the source of any assumptions external to CAIRIS. An example of such an External Document might be an interview transcript. Alternatively, if assumptions are purely based on your own thoughts and feelings then an External Document can be created to make this explicit.
- Select the UX/Document References menu, and click on the Add button. Enter a name that summarises the assumption made, and select Select the external document from the Document combobox box to indicate the document that the assumption is taken from, and enter details of the person who elicited the assumption in the Contributor text box. Finally, in the Excerpt box, enter the extract of text from the external document from which the assumption is based.
- From the Persona Characteristics dialog box, click on Add to add a new characteristic.
- From the General folder, click on the Characteristic tab, and select the Persona and behavioural variable that this characteristic will be associated with. Enter a description of the characteristic and a Model Qualifier; this word describes your confidence in the validity of the characteristic. Possible qualifiers might include always, usually, or perhaps.
- Click on the Grounds tab to open the list of Grounds for this characteristic. The grounds are evidence which support the validity of the characteristic. Click on the Add button to add a new Document Reference. Select the document reference, and a short description of the grounds proposition. Clicking Save will add the new document reference to the grounds list.
- Click on the Warrant tab to open the list of Warrants for this characteristic. The warrants are inference rules which links the grounds to the characteristic. The procedure for adding warrants is identical to the process for adding grounds. After adding a warrant, however, a Backing entry for the warrant is automatically added.
- If you wish to add a Rebuttal – a counterargument for the characteristic – then click on the Rebuttals tab and add a rebuttal using the same procedure for Grounds and Warrants.
- Click on the Create button to create the new characteristic.
- Existing characteristics can be modified by double clicking on the characteristics in the Persona Characteristic dialog box, making the necessary changes, and clicking on the Update button.