Coordination of business activities (CAE)

What is business activity coordination?

Article 24 of Spain’s Law 31/1995 requires cooperation between companies whose workers operate at the same workplace. Royal Decree 171/2004 distinguishes general concurrence, the duties of the site-controlling employer and those of the principal employer. The site-controlling employer can make the workplace available and manage it; having its own workforce there conditions the instructions under Article 8, rather than defining that role. The principal employer contracts work or services belonging to its own activity for performance at its own workplace.

Each situation involves specific duties. All concurrent businesses must cooperate and communicate activity-related hazards that may affect others. The site-controlling employer provides information on site hazards, preventive measures and emergencies; where its own workers operate there, it also issues the instructions specified in Article 8 of Royal Decree 171/2004. Information and instructions must be sufficient, timely and written where required for serious or very serious risks. The principal employer additionally carries out the monitoring and written accreditation requirements of Article 10.

Coordination of business activities (CAE) addresses the actual risks created by shared work. Exchanging certificates alone does not establish that those risks are controlled. Generic documents need to be checked against the activities, location and interactions concerned; administrative completeness cannot replace operational coordination.

Differences between CAE, subcontracting and construction-site coordination

The coordination of activities is confused with other figures that regulate the relationship between companies.

• Coordination of business activities. Preventive obligations when several companies are present at a workplace, regardless of the contractual relationship between them. This is regulated in Article 24 of the LPRL (Law on Prevention of Occupational Risks) and Royal Decree 171/2004.
• Subcontracting in construction. The regime of Law 32/2006 limits the levels of subcontracting and requires the subcontracting book and the registration of accredited companies; it is an additional sectoral regulation to the CAE.
• Coordination in construction projects. For work covered by Spain’s Royal Decree 1627/1997, CAE is integrated with the specific construction arrangements. Appointment of the health and safety coordinator depends on Article 3; safety-study and safety-plan documents follow the applicable conditions. The first additional provision of Royal Decree 171/2004 links both frameworks, without exempting work lacking a formal project from coordination.

Practical rule: CAE applies whenever there is physical concurrence in a center, with or without a contract between the companies; subcontracting and work coordination are specific regimes that are added in the construction sector.

How coordination is managed in practice

The management of workplace safety begins by identifying who is involved, where, when, and with what risks, and by deciding what coordination measures are appropriate to the hazards and complexity of the activities. Royal Decree 171/2004 lists, but is not exhaustive, the following means: information exchange, regular meetings, joint committee meetings, instructions, the presence of preventive resources, and the designation of individuals responsible for coordination.

A typical procedure follows these steps:

1. Identify the concurrence scenario (general concurrence, site-controlling employer or principal employer) and the associated obligations.
2. Exchange information on specific risks and on the risks of the center, in a sufficient and appropriate manner, before the start of the work.
3. Where appropriate, provide written instructions and require contractors and subcontractors to provide proof of their assessment, planning and training related to the work they are to perform.
4. Establish coordination arrangements proportionate to the hazards and complexity, considering meetings, instructions and other measures. The presence of designated preventive resources and appointment of a coordination person follow their respective legal conditions; these are not interchangeable roles.
5. Communicate the information and instructions to the workers of each company and their representatives.
6. Monitor compliance during execution, record checks, and update coordination in the event of changes, incidents, or emergencies.

Documentation must address the concurrent work. A generic assessment that does not identify the site and task conditions does not, by itself, demonstrate that interactions have been managed. Platforms help organise and review documents but do not replace operational coordination on site.

Concurrent activities and the obligations of each party

Royal Decree 171/2004 distinguishes situations that can add duties according to each business’s role:

• Companies sharing a workplace. All those sharing a workplace must cooperate, inform each other about specific risks, report accidents and emergencies, and take into account the information received in their own assessment and planning.
• Site-controlling employer. The party able to make the workplace available and manage it communicates its hazards, preventive measures and emergency arrangements. Where its own workers operate there, it also issues the instructions under Article 8 of Royal Decree 171/2004. Written form is required for the serious or very serious risks specified in Articles 7 and 8.
• Main employer. Anyone who contracts works or services related to their own activity at their center must monitor compliance with regulations by contractors and subcontractors and require them in writing to provide accreditation of risk assessment, planning, training, and information for their workers, as well as verify that they have established means of coordination between them.
• Self-employed workers. They participate in cooperation, information and instruction duties in the situations covered by Article 8.3 of Spain’s Law 20/2007. A business commissioning work or services belonging to its own activity must monitor preventive compliance where that work is performed at its own workplaces, under paragraph 4.
• Person responsible for coordination. This is a preferred arrangement when two or more conditions in Article 13.1 of Royal Decree 171/2004 coincide, subject to the justified substitution permitted by paragraph 2. The person requires at least intermediate-level Spanish preventive training and the competence needed for the function.

The main employer’s responsibility for Social Security and infringements may be joint and several with respect to its contractors under the terms of the Workers’ Statute and the Law on Infringements and Sanctions in the Social Order, which reinforces the importance of effective monitoring.

Common mistakes and effectiveness criteria

The most common deficiencies in the coordination of activities are:

1. Reducing CAE to an exchange of generic documents without analysis of the risks of real concurrency.
2. Not informing contractors of the risks of the center and of emergency measures, or doing so only verbally when the law requires it in writing.
3. Accepting assessments and plans that do not refer to the specific work to be done at the center.
4. Failure to designate a preventive resource or coordinating person when concurrent activities require it.
5. Do not communicate the information to the workers who perform the task or to their representatives.
6. Forgetting to coordinate with self-employed workers, auxiliary service companies and technical visits.

Effective coordination is recognized because the people working at the center are aware of the risks of other companies, instructions reach those who perform the task, and there are recorded checks that the measures are applied.

Regulatory framework in Spain

• Law 31/1995, article 24. Establishes the obligations of cooperation, information and instruction between concurrent companies and the duty of supervision of the main employer; the joint and several liability of the main employer with the contractors and subcontractors of his own activity, for the preventive obligations during the period of the contract and when the infringement occurs in his workplace, is regulated in article 42.3 of the LISOS (Royal Legislative Decree 5/2000).
• Royal Decree 171/2004 . Develops article 24: defines the cases of concurrence, the duty of cooperation, the duties of the site-controlling employer and the principal employer, the means of coordination and the figure of the person in charge of coordination.
• Royal Decree 1627/1997 . Work within its scope follows the specific construction arrangements, including appointment of a coordinator where required and the applicable documentation, linked to the first additional provision of Royal Decree 171/2004.
• Guidelines for effective coordination of business activities (INSST, 2024) . Technical criteria to ensure that coordination is proportionate to the hazards of the activities and is not limited to formal compliance.

The Spanish framework described here is checked against current BOE legislation. A reform proposal does not change duties until it is adopted, published and applicable under its transitional provisions. For work in Latin America, consult the requirements of the country of execution rather than automatically transferring Spanish roles and procedures.

Automating CAE: decisions, exceptions and traceability

Automation is useful when it starts with a map of companies, people, tasks, locations and periods of work. A system can identify outstanding documents, flag a review date, distribute a revised instruction and record its receipt. These administrative operations do not, by themselves, demonstrate that an assessment describes the actual work, that someone understands a hazard or that controls have been implemented. It is useful to distinguish document received, content checked and work authorised, assigning separate responsibilities where the organisation requires them.

A stable rule can compare identity, activity and dates; an AI model can help classify information, but its outputs require verification when they affect a preventive decision. There should be a route for resolving discrepancies, identifying the document used and retaining the reason for the decision. A change of equipment or work area requires an apparently complete file to be checked against the new conditions. Access control does not replace a specific work permit or a technical check before the task begins.

The platform should limit personal data to what each purpose requires and restrict viewing permissions. Article 22 of Spain’s Occupational Risk Prevention Law distinguishes medical information from preventive conclusions concerning fitness or measures: circulating clinical histories between contractors is not a routine CAE function. Management indicators can track changes communicated before work, unresolved exceptions and controls verified on site; the number of uploaded files, considered alone, does not measure preventive effectiveness.

Concurrent duties and assessment of liability

The first question is who can make the workplace available and manage it. That capacity defines the site-controlling employer under Article 2 of Royal Decree 171/2004 and does not necessarily mean ownership of the building. This party must provide information about site hazards, preventive measures and emergencies. Article 8 specifies its instructions where its own workers operate there. The additional status of principal employer requires examining whether the contracted work belongs to its own activity and is performed at its own workplace; it does not arise from every purchase or commission.

Practical responsibilities can be documented for each hazard: who creates it, who receives information, who controls the installation, who implements the measure and who verifies its continuing application. This matrix helps organise work but does not alter legal duties or automatically allocate percentages of fault. Joint and several liability under Article 42.3 of Spain’s Social Order Infringements and Sanctions Law has specific conditions, including own activity, the contractual period and the location of the infringement. It must not simply be transposed to criminal liability or every civil claim.

Following an incident, the actual sequence should be reconstructed using communications, planning changes, permits, observations and decisions. Uploading a certificate does not establish that an interference was communicated; an accident alone does not establish that every company breached its duties. Assessment requires relating obligations, conduct and evidence to the applicable legal regime. Each employer retains responsibility for protecting its workforce even where another organisation coordinates the activities or administers the document platform.

Contractors in premises open to the public

A shopping centre, hospital, museum or station may contain the operator’s workforce, maintenance, cleaning and security contractors, and visitors. CAE addresses work-related interactions and should connect with the premises’ arrangements for protecting the public. Visitors do not thereby become concurrent businesses. A person entering to work, even for a short intervention, requires consideration of that activity and the interactions it could create. The distinction concerns what the person is doing, rather than the label assigned at reception.

In a hypothetical example, repair of an automatic door coincides with cleaning and deliveries at a building entrance. Before work starts, the parties should agree how to segregate the area, provide an accessible alternative route, inform reception and keep emergency access available. Each company communicates its activity and adjusts its planning. The actual solution depends on the assessment and conditions at the location; this account is not a technical repair procedure or authorisation to work on the equipment.

The review should cover opening hours, shift changes and return of the area to normal use. It is useful to identify who confirms removal of tools, reinstatement of protective measures and communication that the intervention has finished. If harm occurs, its legal classification and the responsible parties depend on the facts and applicable employment, civil or sectoral rules, rather than simply on the event having occurred in premises accessible to the public.

Construction: business coordination and the health and safety coordinator

Work within Royal Decree 1627/1997 follows its specific construction arrangements, linked to the first additional provision of Royal Decree 171/2004. The client, contractors, subcontractors and self-employed workers are not interchangeable roles. The execution-stage health and safety coordinator organises CAE within the duties of that position. Appointment does not relieve contractors and subcontractors of implementing the measures assigned to them, or relieve the client of its responsibilities. These are provisions of the Spanish framework, not universal international job descriptions.

The practical process begins by identifying participants and simultaneous or successive phases. Access, supplies, storage areas, interference and changes in methods must be coordinated before they affect another company. Appointment by the client follows Article 3: more than one company, a company together with self-employed workers, or several self-employed workers during execution. This position must not be confused with the coordination person under Article 13 of Royal Decree 171/2004 or a contractor’s designated preventive resource.

The existence of a formal project determines the safety-study and safety-plan documentation arrangements. Work without such a project remains subject to assessment, planning and coordination; it should not automatically be assigned the same document sequence as a project-based construction work. Refurbishment inside an operating factory also requires addressing interference with production outside the construction area. Coordination continues through phase changes and handover of spaces, rather than ending with the initial signature or the approval of a document.

Industrial estates, shared areas and continuing coordination

Sharing a postal address or belonging to a business association does not itself determine who controls each workplace. The analysis should identify areas accessed for work, who manages them and which activities coincide or interact. A private road, shared loading bay or common installation may require operational agreements between companies. Ownership, contractual management and actual use help document roles, without assuming that the estate management body takes over every employer’s legal obligations or directly supervises every contractor.

A hypothetical example is simultaneous deliveries, waste collection and maintenance on a common road. Coordination can establish times, routes, pedestrian segregation, reporting of faults and a contact person for each company. It should also anticipate closures or incidents affecting evacuation and access for external assistance. Sending everyone the same plan is insufficient if temporary construction changes traffic conditions. Arrangements need to reach the people performing the work, including drivers and personnel arriving outside usual administrative hours.

Agreements should be capable of revision when a company joins or an activity changes. A useful record identifies the shared hazard, agreed measure, responsible party, verification date and route for communicating urgent changes. Joint meetings involving preventive worker representation, provided for in Royal Decree 171/2004, can help assess actual effectiveness. Reviews should listen to the people using common areas and close outstanding actions, ensuring that meeting minutes support rather than replace implementation of protective measures.