Scheduler agent supervisor pattern

This Azure cloud architecture pattern diagram template was created on the base of figure in the article "Scheduler Agent Supervisor Pattern" from the Microsoft Developer Network (MSDN) website.
"Scheduler Agent Supervisor Pattern.
Coordinate a set of actions across a distributed set of services and other remote resources, attempt to transparently handle faults if any of these actions fail, or undo the effects of the work performed if the system cannot recover from a fault. This pattern can add resiliency to a distributed system by enabling it to recover and retry actions that fail due to transient exceptions, long-lasting faults, and process failures. ...
An application performs tasks that comprise a number of steps, some of which may invoke remote services or access remote resources. The individual steps may be independent of each other, but they are orchestrated by the application logic that implements the task.
Whenever possible, the application should ensure that the task runs to completion and resolve any failures that might occur when accessing remote services or resources. ...
If the application detects a more permanent fault from which it cannot easily recover, it must be able to restore the system to a consistent state and ensure integrity of the entire end-to-end operation. ...
The Scheduler Agent Supervisor pattern defines the following actors. These actors orchestrate the steps (individual items of work) to be performed as part of the task (the overall process):
- The Scheduler arranges for the individual steps that comprise the overall task to be executed and orchestrates their operation. ...
- The Agent contains logic that encapsulates a call to a remote service, or access to a remote resource referenced by a step in a task. ...
- The Supervisor monitors the status of the steps in the task being performed by the Scheduler. ...
The Scheduler, Agent, and Supervisor are logical components and their physical implementation depends on the technology being used." [msdn.microsoft.com/ ru-RU/ library/ dn589780.aspx]
The Azure cloud system architecture diagram template "Scheduler agent supervisor pattern" for the ConceptDraw PRO diagramming and vector drawing software is included in the Azure Architecture solutin from the Computer and Networks area of ConceptDraw Solution Park.

"Subjective performance evaluation allows the use of a subtler, more balanced assessment of employee performance, and is typically used for more complex jobs where comprehensive objective measures are difficult to specify and/ or measure. Whilst often the only feasible method, the attendant problems with subjective performance evaluation have resulted in a variety of incentive structures and supervisory schemes. One problem, for example, is that supervisors may under-report performance in order to save on wages, if they are in some way residual claimants, or perhaps rewarded on the basis of cost savings. This tendency is of course to some extent offset by the danger of retaliation and/ or demotivation of the employee, if the supervisor is responsible for that employee’s output. ...
Another problem relates to what is known as the "compression of ratings". Two related influences—centrality bias, and leniency bias—have been documented ... The former results from supervisors being reluctant to distinguish critically between workers (perhaps for fear of destroying team spirit), while the latter derives from supervisors being averse to offering poor ratings to subordinates, especially where these ratings are used to determine pay, not least because bad evaluations may be demotivating rather than motivating. However, these biases introduce noise into the relationship between pay and effort, reducing the incentive effect of performance-related pay. ... this is the reason for the common separation of evaluations and pay, with evaluations primarily used to allocate training.
Finally, while the problem of compression of ratings originates on the supervisor-side, related effects occur when workers actively attempt to influence the appraisals supervisors give, either by influencing the performance information going to the supervisor: multitasking (focussing on the more visibly productive activities...), or by working “too hard” to signal worker quality or create a good impression...; or by influencing the evaluation of it, e.g., by "currying influence"... or by outright bribery..." [Principal–agent problem. Wikipedia]
The example "Person demotivated by evaluation - Fault tree analysis diagram" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Fault Tree Analysis Diagrams solution from the Engineering area of ConceptDraw Solution Park.

"A call centre or call center is a centralised office used for the purpose of receiving or transmitting a large volume of requests by telephone. An inbound call centre is operated by a company to administer incoming product support or information inquiries from consumers. Outbound call centers are operated for telemarketing, solicitation of charitable or political donations, debt collection and market research. In addition to a call centre, collective handling of letter, fax, live support software,social media and e-mail at one location is known as a contact centre.
A call centre is operated through an extensive open workspace for call centre agents, with work stations that include a computer for each agent, a telephone set or headset connected to a telecom switch, and one or more supervisor stations. It can be independently operated or networked with additional centres, often linked to a corporate computer network, including mainframes, microcomputers and LANs. Increasingly, the voice and data pathways into the centre are linked through a set of new technologies called computer telephony integration (CTI)." [Call centre. Wikipedia]
This call center network diagram example was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Telecommunication Network Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.