| S/No. | Description of Survey Question (SQ) | SA n (%) | A n (%) | D n (%) | SD n (%) | N n (%) | Weighted mean |
| SQ1 | It is not simple to keep a good overview of the deviations, mitigations and remedial actions on a petroleum facility | 89 (41.20) | 100 (46.30) | 12 (5.56) | 2 (0.93) | 13 (6.02) | 4.2 |
| SQ2 | The changing amount of barrier data is difficult to manage which makes it hard to assess existing/new cumulative risks. | 88 (40.74) | 104 (48.15) | 14 (6.48) | 0 (0.00) | 10 (4.63) | 4.2 |
| SQ3 | Knowledge is still low in Nigeria on the pathways for process safety risk accumulation due to safety critical impairments in a facility | 168 (77.78) | 35 (16.20) | 4 (1.85) | 1 (0.46) | 8 (3.70) | 4.7 |
| SQ4 | There are still no adequate guidance and framework on the management of cumulative risks arising from multiple deviations and impairments in petroleum facilities in Nigeria | 162 (75.00) | 32 (14.81) | 10 (4.63) | 2 (0.93) | 10 (4.63) | 4.6 |
| SQ5 | Data collation for process safety cumulative risk is time and labour intensive, resides in dispersed systems, lacking a single point of access | 165 (76.39) | 38 (17.59) | 3 (1.39) | 1 (0.46) | 9 (4.17) | 4.7 |
| SQ6 | There is no real time tool in Nigeria that visualizes the accumulation of risks from multiple deviations and impairments in a facility | 174 (80.56) | 24 (11.11) | 8 (3.70) | 1 (0.46) | 9 (4.17) | 4.7 |
| SQ7 | Presenting the process safety cumulative risk profile on area plots (plot plan) will give the best view of risk accumulation (cumulative risk) | 12 (5.56) | 51 (23.61) | 11 (5.09) | 0 (0.00) | 142 (65.74) | 3.3 |
| SQ8 | Presenting the process safety cumulative risk profile on area plots (plot plan) and bowtie/Swiss-cheese view will give the best view of risk accumulation (cumulative risk) | 24 (11.11) | 162 (75.00) | 5 (2.31) | 0 (0.00) | 25 (11.57) | 3.9 |
| SQ9 | Presenting the process safety cumulative risk profile on bowties/Swiss-cheese model will give the best view of risk accumulation | 173 (80.09) | 39 (18.06) | 0 (0.00) | 0 (0.00) | 4 (1.85) | 4.8 |
| SQ10 | Using mathematical models (quantitative risk assessment) is better than using “traffic light” scoring system to represent impairment on a barrier | 13 (6.02) | 20 (9.26) | 31 (14.35) | 122 (56.48) | 30 (13.89) | 1.9 |