This overview collects what we have learned in our mandates. An article is written here when the same question has been on the table more than once — not when a topic happens to be in fashion. That is why there are five of them and not fifty. Each one answers decisions that fall before the work starts: whether a middleware pays off, which shop system fits the range, what a procurement procedure settles early, what selling direct really brings in, and how visibility shifts when assistants answer instead of result lists. They are written for people who have to decide and have learned to answer for it. If your question is missing, a conversation is the shorter way than a sixth article.