*3.5. Sample Size*

Sampling was achieved purposefully by partnering with UK's leading construction standards body, the Institution of Civil Engineers (ICE), to identify and select leaders in construction companies who had demonstrated a willingness to be involved in innovative knowledge development. All the interviewees had significant knowledge of the infrastructure sector but often did not have the detailed knowledge of their sustainability, SDG and CSR approaches. For this reason, the sample included 30% that were heads of sustainability, who had the requisite knowledge.
