1. 6. Envisioning the future system: Task model 2 Envisioning the future task world, not available for observation but modeling will allow: comparison to task model 1 analysis reasoning early assessment GTA conceptual framework identical to TM 1

2. 6.1. Sources for envisioning the future task world TM 1: inconsistencies, problems, conflicting goals, user needs  Questions (for TM 2 and for detail specifications) Technology: possibilities and expectations, constraints, challenges  Options Client: business goals, vision, ergonomics, standards, safety and reliability, corporate image  Criteria

3. Conflicting options and criteria Multidisciplinary expertise and creativity needed: Ergonomics (adaptation) psychology / anthropology (the human side) Engineering (the technology side) graphic design, cinematography, typography (arts/crafts) management and marketing (the client needs to sell it)  No reason for unanimity! Envisioning will be followed by specification of details  back-tracking needed

4. Design space analysis Need for a design rationale Question / Options / Criteria ownership of Question guided brainstorming on O and C between disciplines formal representation communication between disciplines, and with client and stakeholders possibilities of back-tracking

5. Question / Options / Criteria C1 O1 C2 C3 Q O2 C4 C5 O3 C6 C7 A “formalism”

6. 6.2. Assessment of task model 2 Task model 1 models current task world. Evaluation concerns completeness (as far as relevant) and correctnes Task model 2 is a global specification of new situation. Needs to be proposed to prospective users, to client, and needs evaluation on feasibility. Techniques: animation of task model (U. Paderborn: Swillus, Bomsdorff) verbal scenario video scenario