The old-age allowance is either the legal minimum wage (1/10 of the monthly salary per year of service; 1/15 months of additional salary per year of service beyond 10 years) or the pension salary set in the collective agreement or employment contract, depending on the most favourable date. The trial period, often provided for by a branch agreement, is included in a specific contract clause. It is only valid if it is recorded in writing and if the principle and duration of that period are determined as soon as staff are hired. If so, the reference to collective agreements on the working conditions of the worker; The CDI contract is the indeterminate contract (indeterminate contract or indeterminate contract), which is more often considered for full-time jobs than for part-time jobs. In most traditional cases, this is the employment contract, which is the ultimate goal after internships, apprenticeships, CDDs, etc. The contract has no fixed duration and, therefore, the oral agreement and written declaration vary from case to case. If the employee prefers a written statement, the user must submit a written contract. The contract may be concluded in writing or the result of a verbal agreement between the employer and the worker on full-time indeterminate employment contracts (except for statutory provisions or branch contracts). However, the employer must inform the worker in writing of the essential points of the employment relationship: the identity of both parties, the place of work, the position to be taken and the remuneration. If the company has entered into a collective agreement that the employment contract of any new worker begins with a probationary period, there is no need to include a probationary period clause in each contract. Since they do not have a special clause, an indeterminate contract may be terminated either at the request of one of the parties (dismissal, resignation, retirement, etc.), by agreement between the parties or because of force majeure. A distinction should be made between “changes in terms of employment”, on which the employer can unilaterally decide (hours, leave dates, etc.) and “modification of the employment contract”, which requires the agreement of the employee and which relates to the fact that the employment contract is an agreement that governs an employment relationship by which one person undertakes to work under another for remuneration.