Each cell has full ownership of the values it provides towards external customers or other cells.

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This means that the cell is able to cover the full lifecycle of its values, from idea to design, implementation/execution, quality insurance, maintenance and beyond.

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The cell is able to cover all aspects of its value creation and is therefore cross-functional.

Of course Cells can buy the services or products they need from external suppliers or other cells to improve their ability to deliver.

If they do so, they still take full responsibility for all their Values including the ones acquired from other Cells. Ownership and responsibility cannot be delegated. If something goes wrong, the cell is fully responsible for all the components it has purchased.

Also, if outsourcing services slows down the speed of the cell due to external dependencies, it is a sign that end-to-end responsibility is not being given at the required level.