Under Faraday the ME and WE branches have replaced task books with career development journals whereby the individual displays their competence using competence record sheets against a competency framework appropriate to their rate. Quite different to task books and, I believe, common to how things are done in the civilian world
Career development journals are good but only for those who want to develop their careers. If you're looking to educate engineers about the systems they work on then I feel task books more than serve their purpose. Be interested to hear your views though.