Union
$$A \cup B =$$
{ Assess, Clarifying Objectives, Determining Characteristics, Establishing Functions, Evaluating Alternatives, Execute, Generating Alternatives, Identifying Opportunities, Improving Details, Plan, Re-evaluate, Setting Requirements, Stop }
Symmetric Difference
$$A \ominus B =$$
{ Assess, Clarifying Objectives, Determining Characteristics, Establishing Functions, Evaluating Alternatives, Execute, Generating Alternatives, Identifying Opportunities, Improving Details, Plan, Re-evaluate, Setting Requirements, Stop }
Cartesian Product
$$A \times B =$$
{ (Assess, Clarifying Objectives),
(Assess, Determining Characteristics),
(Assess, Establishing Functions),
(Assess, Evaluating Alternatives),
(Assess, Generating Alternatives),
(Assess, Identifying Opportunities),
(Assess, Improving Details),
(Assess, Setting Requirements),
(Execute, Clarifying Objectives),
(Execute, Determining Characteristics),
(Execute, Establishing Functions),
(Execute, Evaluating Alternatives),
(Execute, Generating Alternatives),
(Execute, Identifying Opportunities),
(Execute, Improving Details),
(Execute, Setting Requirements),
(Plan, Clarifying Objectives),
(Plan, Determining Characteristics),
(Plan, Establishing Functions),
(Plan, Evaluating Alternatives),
(Plan, Generating Alternatives),
(Plan, Identifying Opportunities),
(Plan, Improving Details),
(Plan, Setting Requirements),
(Re-evaluate, Clarifying Objectives),
(Re-evaluate, Determining Characteristics),
(Re-evaluate, Establishing Functions),
(Re-evaluate, Evaluating Alternatives),
(Re-evaluate, Generating Alternatives),
(Re-evaluate, Identifying Opportunities),
(Re-evaluate, Improving Details),
(Re-evaluate, Setting Requirements),
(Stop, Clarifying Objectives),
(Stop, Determining Characteristics),
(Stop, Establishing Functions),
(Stop, Evaluating Alternatives),
(Stop, Generating Alternatives),
(Stop, Identifying Opportunities),
(Stop, Improving Details),
(Stop, Setting Requirements) }
Design methods