EDSK ... that they must be involved in implementation

"The designer of a new kind of system must participate fully in the implementation."

"… the designer of a new system must not only be the implementor and the first large-scale user; the designer should also write the first user manual. … If I had not participated fully in all these activities, literally hundreds of improvements would never have been made, because I would never have thought of them or perceived why they were important."

—Donald E. Knuth