You often understand the way to the goal as a process that consists of the sum of many good technological and organizational decisions. These decisions are made in many places in the company and in projects. It is important to do the right things right.
Effectiveness is to do the right things (right). Effectiveness is a measure of the achievement of goals (effectiveness, quality of goal achievement), ie the strategic component. Effectiveness is more important than efficiency. These requires foresight, knowing where the journey is going, knowing how the journey is going, knowing what and where the destination is, knowing who initiates this journey and why, knowing what in each step of the process, e.g. IT projects, are the right things.
Efficiency is to do the right things right. Efficiency is a measure of economic efficiency (cost-benefit ratio), ie the tactical, operational component. Effectiveness is more important than efficiency. It makes no sense to solve the wrong thing in detail efficiently. Efficiency is closely linked to experience, discipline and tenacity in detail. Efficiency does not just fall from the sky. Efficiency in a project means designing, investigating, questioning and measuring every significant detail; Finally, to have enough experience and knowledge to judge efficiency.