Жоспарлаудан бастауға дейінгі уақыт аралығы

Time between planning and starting something

A lead time is the latency between the initiation and completion of a process. For example, the lead time between the placement of an order and delivery of new cars by a given manufacturer might be between 2 weeks and 6 months, depending on various particularities. One business dictionary defines "manufacturing lead time" as the total time required to manufacture an item, including order preparation time, queue time, setup time, run time, move time, inspection time, and put away time. For make to order products, it is the time between release of an order and the production and shipment that fulfill that order. For make to stock products, it is the time taken from the release of an order to production and receipt into finished goods inventory.

A conventional definition of lead time in a supply chain management context is the time from the moment the customer places an order (the moment the supplier learns of the requirement) to the moment it is ready for delivery. In the absence of finished goods or intermediate (work in progress) inventory, it is the time it takes to actually manufacture the order without any inventory other than raw materials. The Chartered Institute of Procurement & Supply identifies "total lead time" as a combination of "internal lead time" (the time required for the buying organisation's internal processes to progress from identification of a need to the issue of a purchase order) and "external lead time" (the time required for the supplying organisation's processes, including any development required, manufacture, dispatch and delivery).

When talking about Order Lead Time (OLT) it is important to differentiate between the definitions that may exist around this concept. Although they look similar, there are differences between them that help the industry to model the order behavior of their customers. The four definitions are :
The Actual Order Lead Time (OLTActual) The order lead time, refers to the time which elapses between the receipt of the customer's order (Order Entry Date) and the delivery of the goods." The Requested Order Lead Time (OLTRequested) represents the time between the Order Entry Date and the customer requested delivery date; this measurement could help the company to understand the order behavior of the customers and help to design profitable models to fulfill customer needs. The Quote Order Lead Time (OLTQuote) is the agreed time between the Order Entry Date and the supplier's committed deliver date of goods as stipulated in a supply chain contract. The Confirmed Order Lead Time (OLTConfirmed) represents the time between the Order Entry Date and the by the supplier confirmed'' delivery date of goods.

The Average OLT based on Volume (OLTV) is the addition of all the multiplications between the volume of product we deliver (quantity) and the OLT divided by the total quantity delivered in the period of time we are studying for that specific facility. By doing this the company will be able to find a relation of volume weighted between the quantities of material required for an order and the time requested to accomplish it. The volume metric could be applied to the 4 types of OLT. The figure obtained from this calculation will be the average time (e. g. in days) between order placing and the requested delivery date of a specific customer under consideration of the average quantities ordered during that particular time.

In project management, lead time is the time it takes to complete a task or a set of interdependent tasks. The lead of the entire project would be the overall duration of the critical path for the project. According to the PMBOK (7th edition) by the Project Management Institute (PMI), lead time is the "time between a customer request and the actual delivery." The lead time is a deliverable metric and a customary measure. The lead time shows the amount of elapsed time from a chunk of work or story entering the backlog, to the end of the iteration or release. A smaller lead time means that the process is more effective and the project team is more productive. Lead time is also the saved time by starting an activity before its predecessor is completed. According to the PMBOK (7th edition) by PMI, lead is "The amount of time whereby a successor activity can be advanced with respect to a predecessor activity". An example would be scheduling the start of a 2 week activity dependent with the finish of the successor activity with a lead of 2 weeks so they will finish at the same time.

Lead time in publishing describes the amount of time that a journalist has between receiving a writing assignment and submitting the completed piece. Depending on the publication, lead times can be anything from a couple of hours to many months/years.

Lead time (when referring to a disease) is the length of time between detection of a disease through screening and the moment in time where it would have normally presented with symptoms and led to a diagnosis. An example of this is seen with breast cancer population screening, where women who are asymptomatic have a positive test result with mammography, whereas the underlying disease would have taken many more years to manifest.

Lead time in video games can refer to the amount of time certain special, important actions in high twitch action games, such as using health recovering items, may need to take in order to be completed successfully. Lead time can be used to prevent players from abusing helpful abilities or items by making them a little more difficult to use safely, requiring some strategy, risk or caution.