But what was even more typical for the Stasi was the use of human intelligence, people who reported secretly to the Stasi. For the Minister of State Security, these so-called unofficial employees were the most important tools. From 1975 on, nearly 200,000 people collaborated constantly with the Stasi, more than one percent of the population. And in a way, the minister was right, because technical instruments can only register what people are doing, but agents and spies can also report what people are planning to do and what they are thinking. Therefore, the Stasi recruited so many informants. The system of how to get them and how to educate them, as it was called, was very sophisticated. The Stasi had its own university, not far away from here, where the methods were explored and taught to the officers. This guideline gave a detailed description of every step you have to take if you want to convince human beings to betray their fellow citizens. Sometimes it's said that informants were pressured to becoming one, but that's mostly not true, because a forced informant is a bad informant. Only someone who wants to give you the information you need is an effective whistleblower. The main reasons why people cooperated with the Stasi were political conviction and material benefits. The officers also tried to create a personal bond between themselves and the informant, and to be honest, the example of the Stasi shows that it's not so difficult to win someone in order to betray others. Even some of the top dissidents in East Germany collaborated with the Stasi, as for instance Ibrahim Böhme. In 1989, he was the leader of the peaceful revolution and he nearly became the first freely elected Prime Minister of the GDR until it came out that he was an informant.