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+Consent Management
+===================
+Checking the Consent Documents
+-------------------------------
+
+There are three options that justify a **Legal basis for data processing**:
+- **Recruitment consent** (Art. 6 (1) lit. a, Art. 9 (2) lit. a GDPR)
+- **Study consent** (Art. 6 (1) lit. a, Art. 9 (2) lit. a GDPR and Art. 27 BDSG)
+- **Guardianship** (Art. 6 (1) lit. a, Art. 9 (2) lit. a GDPR and Art. 1626, 1902
+  BGB)
+
+Castellum is mainly intended for the management of recruitment consents. Study
+consents must be obtained separately from the respective study conducters
+
+1. Log in to Castellum by using your username and password
+     
+2. Click on **Admin** on the front page
+
+3. Scroll all the way down and click on **Consent documents**
+   
+   - You will see a list of all consent documents that have been created
+   - Additional information displayed is the date of creation and whether the
+     consent document is valid or not
+     
+Updating the Consent Documents
+-------------------------------
+
+Consent documents are marked as invalid if a change in legislation occurs, substantial
+changes have been made to the old document or other reasons require the signing
+of a new document.
+
+1. There are two options you may implement when a consent document becomes invalid
+   For both options first go to **Admin** on the front page > **Consent documents**
+   in the last section > click on the date the consent document you want to change
+   the status for has been created
+   
+1.1. The consent form can be marked as **Is deprecated** AND **Is valid**
+     - **Is deprecated** can be considered as an intermediate step between the
+       validity and invalidity of a consent document
+     - with this option, the subjects may remain in the database and may be recruited
+       but a new consent document should be obtained soon
+     
+1.2. If you uncheck the box saying **Is valid** but leave the check in the box stating
+     **Is deprecated**, the consent document is generally marked as no longer valid
+     - If the invalidity of the consent is saved, there is no longer consent for
+       the recruitment of a subject in the database
+This does not apply when the **Legal basis for data processing** is a **Study
+consent** or **Guardianship**.
+You can see the legal basis for data processing for each subject individually by
+following the instructions below:
+
+   - Click on **Subjects** on the front page
+   - Type in the first and last name of the subject and click on **Submit**
+   - Click on **details** next to the subject
+   - In the tab **Overview** you can see the three possibilities for consent and
+     which of them apply to the respective subject
+
+
+2. If you wish to upload a consent document that is currently valid, proceed as
+   follows:
+   
+   - Click on **Admin** on the front page
+   - Scroll down and click on **Consent documents**
+   - Click **ADD CONSENT DOCUMENT** (grey oval on the upper right)
+   - Select a file
+   - Choose one of the three saving options
+  
+   
+Deletion of a Consent Document
+------------------------------
+1. Click on **Admin** on the front page
+2. Scroll down and click on **Consent documents**
+3. Click on the consent document to be deleted
+4. Click on **Delete**
+5. Confirm the question regarding the deletion of the consent document by clicking
+   **Yes, I'm sure**
+
+
+Maintenance of Recruitment Consents
+------------------------------------
+In order to get an overview of all subjects for whom a new recruiting consent is
+required, proceed as follows:
+
+1. Click on **Subjects** on the front page
+
+2. Go to **Maintenance**
+
+3. Click on the fourth tab **Consent**
+
+   - You can see which **subjects have an outdated consent** in a list
+
+4. Click on **Details** next to **Last updated on: XY**
+
+   - A new tab will open for each subject for whom consent is deprecated or invalid
+
+5. Go to **Data protection** (fourth tab)
+
+   - If you see an orange description field that says **The current consent refers
+     to an outdated document and will soon expire, thus rendering the recruitment
+     consent invalid. Please contact this subject and ask them to consent to the
+     latest document or withdraw their consent. This message will disappear once
+     you change the value of the checkbox.**, proceed with steps 6-7
+
+6. Obtain valid consent for recruitment either online, by telephone or postal
+   
+   - As an intermediate step, check the box **Recruitment consent** once
+  
+7. If the subject consents to the latest document or withdraws its consent, that
+   has to be marked
+
+   - If the subject consents to the latest document: Press **Confirm** in the box
+     **Recruitment consent** and press **Save**
+   - If the subject requests GDPR deletion, check the box **To be deleted** and 
+     press **Save**
+
+