What is the difference between the push and pull model?

In a very easy and simple way, push is similar to mass-production; producer is producing large quantities in-accordance to the producer own forcast and analysis to be available in market (waiting for customer demand) and it may lead to large inventory too. However, pull goes to the demand of customer, producer is producing upon the customer's demand with spacific quantities related to different methods, such as JIT, etc. Pull also refers to Zero inventory theoretically.

The difference is as follows:

 

Push in Marketing happens when the supplier has the domination , influence and power to control the trend .I.e the supplier has the control over the market demand. 

 

Pull in Marketing when the supplier respond to the marketing demands and adjust products specifications to comply with the demands.

The difference between a push and a pull system is how the units of work are assigned to the person who will be carrying out that unit of work. The concept of push and pull aren't unique to software development -the idea originates from logistics and supply chain management.

In a push system, a some kind of task is created and then assigned to a developer. A task could be anything from the implementation of a requirement (or a component needed to realize a requirement) to a bug fix to a document to write. Someone, usually some kind of manager or team leader, takes the units of work that need to be done and then allocate them to the members of the team to complete. Simply, work is pushed onto the people who will be doing it.

In a pull system, the tasks that must be done are stored in a queue, often a priority queue of sorts. An example might be Scrum's product and sprint backlogs, which contain user stories that are to be done. A developer who is currently not working on anything will go to the queue and take off the highest priority story that they are able to do and work on it. The people who are doing the work pull the work out of a list and do it.

The concept of push and pull aren't related to iterative/incremental versus sequential development. A team using iterative/incremental/agile techniques could use a push system, while a team using sequential development could use a pull system. However, typically, the agile methods (XP, Scrum) favor self-organizing teams and therefore pull systems.

Pull Concept - Customer will take the items based on the market requirement. Supplier also produce the item based on the requirement, ( What is required, When its is required, How much its is required - This is pull concept) 

 

Push Concept - Supplier will push their items based on the production and not as per the demand. 

 

Pull means Minimum inventory, Minimum wastage, High quality, Less space is required, 

 

Push means Hign inventory, Hign wastage, more rejection, More space required, 

 

 

In supply chains the stages are operating normally both in push- and pull-manner. Push production is based on forecast demand and pull production is based on actual or consumed demand. The interface between these stages is called the push–pull boundary.

Because the question is about the difference only, so my answer will be

High investment in warehousing or less inventory for sales in PUSH model Vs Convenient inventory for delivery in PULL model

PUSH MODEL IS MRP - MATERIAL REQUIREMENT PLANNING BASED ON FORETASTED MARKET GROWTH BASED ON HISTORICAL GROWTH AND MARKET STRENGTH ( % OF MARKET SHARE ) 

 

PUSH IS PRODUCING GOODS BASED ON ESTIMATED CUSTOMER DEMAND PATTERN WHICH IS ESTIMATED FROM THE PAST AND PRESENT MARKET STRENGTHS

 

 

AND THE PULL IS BASED ON JIT ( JUST IN TIME ) MATERIALS - PRODUCTION BASED ON ORDER ON HAND - NO EXCESS , OR LEAN INVENTORY MODELS 

 

Push

mean supplier produce not according customer need , he produce according his capacity 

and it can be suitable for big suppliers who have ability to store , meantime its dangerous for small suppliers .

 

Pull

mean supplier produce according customer needs , this is safe and suitable for small suppliers 

Push is basically producing and then realising demand and pull is realising demand and then producing products. No single product is completly pull or push based reather they are continum and every product lies in between of extreams.

Definitions are very important to create context for this article.  A supply chain is a minimum of a network of a business, its suppliers and customers.  Thus, supply chain management by a particular business is the management of human capital, processes, materials and information between that business, its suppliers and its customers that ensures maximum customer service at maximum margin to that business.  Importantly, while all participants in a supply chain can benefit from improvements to the functioning of the supply chain as a whole, rarely do they benefit equally - See more at: http://www.advantageinternational.com/www/content/default.aspx?cid=921&#sthash.44Vm9HaY.dpuf