Table 7.

Experimental study hypotheses.

Null Hypothesis	Alternative Hypothesis
$H_{00}$: Enriching the security tactics catalog with trade-offs for designing secure IoT systems does not improve practitioners’ architectural design decisions’ efficiency	$H_{01}$: The trade-offs-aware catalog offers enhancements over the standard catalog, boosting the overall efficiency of the decisions made by secure IoT system designers
$H_{10}$: Enriching the security tactics catalog with trade-offs for designing secure IoT systems does not improve practitioners’ architectural design decisions’ effectiveness	$H_{11}$: The trade-offs-aware catalog offers enhancements over the standard catalog, boosting the overall effectiveness of the decisions made by secure IoT system designers
$H_{20}$: Enriching the security tactics catalog with trade-offs for designing secure IoT systems does not improve practitioners’ architectural design decisions’ usefulness	$H_{21}$: The trade-offs-aware catalog offers enhancements over the standard catalog, boosting the overall usefulness of the decisions made by secure IoT system designers
$H_{30}$: Enriching the security tactics catalog with trade-offs for designing secure IoT systems does not improve practitioners’ architectural design decisions’ accuracy	$H_{31}$: The trade-offs-aware catalog offers enhancements over the standard catalog, boosting the overall accuracy of the decisions made by secure IoT system designers