# Working together – Agenturbewertung

> Contracts, acceptance, code ownership and what happens when it goes wrong.

- [Software Acceptance Testing in Contracts: What to Agree](https://agenturbewertung.de/en/working-together/software-acceptance-testing/): A software acceptance testing clause in a contract should define test cases before development starts, a fixed testing window, severity levels for defects and the thresholds that allow you to reject delivery. Watch for deemed acceptance, where silence or going live counts as sign-off, and tie the final payment and the start of any warranty period to written acceptance.
- [Who Owns the Source Code When an Agency Builds Your App?](https://agenturbewertung.de/en/working-together/who-owns-the-source-code/): Paying for software does not make you its owner. In the US and UK, copyright in code written by an agency's staff belongs to the agency unless the contract assigns it to you in a signed written document. In Germany you receive usage rights, never the copyright itself. Put ownership and code handover in the contract.
- [Switching Agencies: Handover Checklist and Right Order](https://agenturbewertung.de/en/working-together/switching-agencies/): When switching agencies, secure every login, domain, account and the source code before you give notice. Then check the notice period in the contract, move domains using the registrar's auth code, and plan two to four weeks in which both agencies have access. Finish by removing the old agency's access and asking for written confirmation that your data was deleted.
- [Website Maintenance Contract: What to Include and Check](https://agenturbewertung.de/en/working-together/website-maintenance-contract/): A website maintenance contract should spell out updates for the CMS, plugins and PHP, off-site backups with a documented restore test, uptime and security monitoring, separate response and fix times by severity, a set number of hours for small changes and a monthly report. You should also keep your own access to the code, server and backups at all times.

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