Delta model is a way of looking at how businesses work, and it has three parts: customer needs, the strategic system, and the product or service.
Imagine you are making lemonade, and you want to sell it. The first thing you need to think about is what your customers want. Some people might want sweet lemonade, while others might want tart lemonade. You need to figure out what your customers like and make your lemonade based on that. This is the first part of the delta model: customer needs.
Once you know what your customers want, you need to figure out how to make it happen. This is where the second part of the delta model comes in: the strategic system. This means thinking about things like how much it will cost to make the lemonade, where you will sell it, and how you will get the word out about your lemonade. You might decide to sell your lemonade at a stand in your neighborhood, or you might try to sell it online. The strategic system is all about figuring out the best way to make and sell your lemonade.
Finally, you need to actually make the lemonade. This is the third part of the delta model: the product or service. In this case, the product is the lemonade you make. You need to make sure that you are making the right kind of lemonade, that it tastes good, and that it is safe to drink. Once you have made the lemonade, you can start selling it to your customers.
So, in summary, the delta model is about figuring out what your customers want, figuring out how to make and sell it, and then actually making and selling it. It's like making lemonade!