## 3 The Safety4 All Dataset
### Locations and Checklists  
A checklist is a taxonomy of possible health and safety hazards that can be encountered in a location and is used to guide the SOs to produce structured observations. Each location type has a corresponding checklist (i.e., offices checklist). This checklist offers an extensive set of probable events and issues, organized in groups and sub-groups, to be referenced by the SO during inspection. Every probable issue is placed under a specific sub-group of the checklist taxonomy. For example, regarding an office, an SO may detect and report an issue that falls in the group 'Fire Safety' and the sub-group 'Fire Extinguishers'. The checklists' taxonomy is not exhaustive and SOs are not expected to make a binary (i.e., yes/no) decision for every possible issue. The software that captures the SO reports allows \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Reference Number** & **Downstream Tasks** & **Contrastive Objective** & **Pretraining Datasets** \\ \hline
[69] & Unsupervised natural language & InfoNCE [68] & COCO [80], Flickz30k [81] \\ \hline
[70] & Action recognition & InfoNCE [68] & HowTo100M [82] \\  & Video retrieval & & \\ \hline
[74] & False news detection & N-pair [6] & – \\  & Sentiment analysis & & \\ \hline
[75] & Video retrieval & Cross-CLR [75] & – \\ \hline
[76] & Object detection & InfoNCE [68] & COCO [80], Stock [83] \\  & Cross-modal retrieval & & \\ \hline
[77] & Action recognition & & \\ \hline
[78] & Action localization & MIL-NCE [77] & HowTo100M [82] \\  & Video retrieval & & \\ \hline
[79] & Image/sound/action & & \\  & classification & & \\  & Zero-shot retrieval & & \\ \hline
[79] & Few-shot/zero-shot & N-pair [65] & YFCC100M [85], internal image-text dataset [79] \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Summary of related works that utilize contrastive objectives for multimodal representation learning. them to browse these checklists as a reference guide for what needs to be inspected and audited in every location type and situation, in general. Every distinct location type presents a very specific set of relevant and probable hazards. To effectively assist the SO in identifying them, a specific checklist has been studied, defined, and developed. The checklist is curated according to the scope and specifications of the sites that it serves, updating its internal structure of groups and subgroups. Despite the differences between locations and the safety parameters that profile them, there can be checklist overlap of common issues and shared hazards. For example, hazards associated with hot works (welding, disc cutting etc.) will be covered only in the construction-site checklist, whereas subjects relevant to fire safety will be the same in all four checklists (i.e., the presence of minimum required units for fire extinguishers). Table 3 shows the number of groups and sub-groups in the checklists of the four location types. **Office spaces**: This location type covers all office spaces, regardless of their size and complexity. The respective checklist focuses on three main groups: (i) issues about the site itself, (ii) issues relevant to the workstations, and (iii) other special matters. The first category includes sub-categories such as emergency exits, fire safety, electro-mechanical installations, lighting, etc. The second category includes ergonomic hazards for workstations, while working on computers, cleaning, storing of materials, drivers etc. The last category addresses the employer's compliance with very specific aspects, such as documentation, training, etc. While large office-buildings may feature more hazards than small ones, in terms of actual cases and similar issues, their main groups and types remain the same. **Warehouses**: Warehouses are a distinctly different site as they have some unique hazards related to manual work, the operation of lifting equipment, and warehousing structures.