Protecting yourself from responsibility for mistakes by blaming your partner in case of failure or, in case of success, by attributing it only to your merits is nothing to boast about.
I look at design from a wider perspective than merely creating a design and obtaining remuneration – a deeper motivation to engage in a venture begins.
Example of a contract: A designer and a producer agree on royalties as regards the sales.
In case of failure, the designer and the producer lose their funds and time involved in this undertaking.
In case of successful commercialization of the design, both the designer and the producer receive a return on their investment.