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Correa, Capítulo 9 - Minerva.ufpel.tche.br

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Gestao de Redes de Suprimento<<strong>br</strong> />

Henrique L. <strong>Correa</strong>, Ed Atlas, 2010<<strong>br</strong> />

Capitulo 9 - Gestão e coordenação de<<strong>br</strong> />

estoques na rede global de<<strong>br</strong> />

suprimentos


O que são estoques e quais suas funções<<strong>br</strong> />

principais?<<strong>br</strong> />

Quais os tipos de estoques envolvidos em gestão<<strong>br</strong> />

global de redes de suprimento?<<strong>br</strong> />

Quais as principais técnicas de gestão de estoques<<strong>br</strong> />

e quando elas são mais indicadas?<<strong>br</strong> />

Qual o impacto de se ter uma rede de suprimentos<<strong>br</strong> />

sem coordenação entre sistemas locais de gestão<<strong>br</strong> />

de estoques?<<strong>br</strong> />

Como ter uma gestão de estoques coordanada na<<strong>br</strong> />

rege global de suprimentos?


Mercado & ambiente global<<strong>br</strong> />

Fornecedores<<strong>br</strong> />

Governanca da rede de suprimento<<strong>br</strong> />

Estrategia<<strong>br</strong> />

Gestao de risco / Gestao de incentivos / Gestao de desempenho<<strong>br</strong> />

Concorrentes<<strong>br</strong> />

Empresa focal<<strong>br</strong> />

Fronteira nacional<<strong>br</strong> />

Relacionamento e confianca entre parceiros<<strong>br</strong> />

Fluxos de informacoes<<strong>br</strong> />

Fluxo direto de bens/ servicos<<strong>br</strong> />

Fluxo financeiro (direto)<<strong>br</strong> />

Fluxo reverso de bens (devolucoes)<<strong>br</strong> />

Fluxo financeiro (reverso)<<strong>br</strong> />

Clientes<<strong>br</strong> />

Usuarios


1.<<strong>br</strong> />

2.<<strong>br</strong> />

3.<<strong>br</strong> />

Você já estudou a diferença entre<<strong>br</strong> />

sistemas de gestão de fluxo<<strong>br</strong> />

puxados e empurrados (veja o<<strong>br</strong> />

<strong>Capítulo</strong> 7 para refrescar a<<strong>br</strong> />

memória). Você considera que o<<strong>br</strong> />

sistema AutoGIRO é um sistema<<strong>br</strong> />

empurrado ou puxado? Justifique.<<strong>br</strong> />

Explicite, em suas próprias<<strong>br</strong> />

palavras, o porquê de o sistema<<strong>br</strong> />

AutoGIRO ser, não apenas um bom<<strong>br</strong> />

sistema de gestão de estoques,<<strong>br</strong> />

mas ser um importante sistema de<<strong>br</strong> />

coordenação de decisões de<<strong>br</strong> />

estoque na rede de suprimentos.<<strong>br</strong> />

O sistema AutoGIRO reorganizou a<<strong>br</strong> />

rede de suprimentos de forma que<<strong>br</strong> />

algumas atividades mudaram, de<<strong>br</strong> />

ser executadas por um elo, para<<strong>br</strong> />

serem feitas por outro elo mais<<strong>br</strong> />

habilitado a executá-las.<<strong>br</strong> />

Identifique, no caso, a(s)<<strong>br</strong> />

situação(ções) em que isso ocorreu.


Estoques são acúmulos de recursos materiais entre<<strong>br</strong> />

etapas de um processo de transformação. Os níveis<<strong>br</strong> />

de estoques variam quando os fluxos de entrada e<<strong>br</strong> />

de saída da etapa variam, um em relação ao outro.<<strong>br</strong> />

entrada<<strong>br</strong> />

estoque<<strong>br</strong> />

Etapa 3<<strong>br</strong> />

saida


Por que<<strong>br</strong> />

surgem os<<strong>br</strong> />

estoques?


Estoque de matérias primas e componentes<<strong>br</strong> />

◦<<strong>br</strong> />

materias que serão utilizados como ingredientes do<<strong>br</strong> />

processo produtivo<<strong>br</strong> />

Estoque em processo<<strong>br</strong> />

◦ materiais que já começaram a ser processados pela<<strong>br</strong> />

operação mas ainda têm que passar por etapas<<strong>br</strong> />

subsequentes de processamento<<strong>br</strong> />

Estoque de produtos acabados<<strong>br</strong> />

◦ produtos finais do processo em questão<<strong>br</strong> />

Estoque de materiais para manutenção, reparo,<<strong>br</strong> />

consumo e movimentação<<strong>br</strong> />

◦ materiais de apoio ao processo.


A visão futura do consumo, que direciona as<<strong>br</strong> />

decisões de ressuprimento, pode ser obtida<<strong>br</strong> />

de duas formas básicas: previsões ou<<strong>br</strong> />

cálculos;<<strong>br</strong> />

◦<<strong>br</strong> />

◦<<strong>br</strong> />

À demanda futura que tem que ser prevista dá-se o<<strong>br</strong> />

nome de demanda independente.<<strong>br</strong> />

À demanda futura que pode ser calculada dá-se o<<strong>br</strong> />

nome de demanda dependente.


Para sistemas empurrados –<<strong>br</strong> />

◦<<strong>br</strong> />

MRP:<<strong>br</strong> />

O MRP é um sistema centralizado, em que um<<strong>br</strong> />

sistema computacional, baseado em base de<<strong>br</strong> />

dados, calcula, a partir dos planos de produção<<strong>br</strong> />

futura, as necessidades de materiais, quando a o<<strong>br</strong> />

que, quando e quanto produzir e comprar.


Caneta<<strong>br</strong> />

NIC<<strong>br</strong> />

1 1 1<<strong>br</strong> />

Corpo<<strong>br</strong> />

Tampa<<strong>br</strong> />

Carga N<<strong>br</strong> />

N<<strong>br</strong> />

N<<strong>br</strong> />

10 g Aditivo1<<strong>br</strong> />

g<<strong>br</strong> />

Plastico<<strong>br</strong> />

(cor<<strong>br</strong> />

X<<strong>br</strong> />

azul)<<strong>br</strong> />

Item tempo de obtenção comprado/produzido<<strong>br</strong> />

Caneta NIC 1 semana produzido<<strong>br</strong> />

Tampa N 2 semana comprado<<strong>br</strong> />

Carga N 1 semanas comprado<<strong>br</strong> />

Corpo N 1 semana produzido<<strong>br</strong> />

Plástico X 2 semanas comprado<<strong>br</strong> />

Aditivo (cor azul) 1 semana comprado<<strong>br</strong> />

16<<strong>br</strong> />

OC Plastico X<<strong>br</strong> />

(1000g)<<strong>br</strong> />

17<<strong>br</strong> />

Aditivo (1g)<<strong>br</strong> />

Plastico X (10g)<<strong>br</strong> />

OC Aditivo<<strong>br</strong> />

(100g)<<strong>br</strong> />

OC Tampa N<<strong>br</strong> />

(100)<<strong>br</strong> />

Tampa N (1)<<strong>br</strong> />

18<<strong>br</strong> />

OP Corpo N<<strong>br</strong> />

(100)<<strong>br</strong> />

OC Carga N<<strong>br</strong> />

(100)<<strong>br</strong> />

Corpo N (1)<<strong>br</strong> />

Carga N (1)<<strong>br</strong> />

19<<strong>br</strong> />

OP NIC<<strong>br</strong> />

(100)<<strong>br</strong> />

Caneta NIC<<strong>br</strong> />

20<<strong>br</strong> />

Pedido (100)<<strong>br</strong> />

(Canetas NIC)


Situacao sem coordenacao<<strong>br</strong> />

de sistemas de gestao de<<strong>br</strong> />

estoque<<strong>br</strong> />

Demanda independente (maior<<strong>br</strong> />

incerteza porque depende de<<strong>br</strong> />

previsao)<<strong>br</strong> />

Demanda dependente<<strong>br</strong> />

(menorincerteza porque<<strong>br</strong> />

depende de calculo)<<strong>br</strong> />

Tampa<<strong>br</strong> />

N<<strong>br</strong> />

3 g 0.5 g<<strong>br</strong> />

Plastico<<strong>br</strong> />

Y<<strong>br</strong> />

Aditivo<<strong>br</strong> />

Fornecedor de<<strong>br</strong> />

Tampa N<<strong>br</strong> />

Plastico<<strong>br</strong> />

X<<strong>br</strong> />

Caneta<<strong>br</strong> />

NIC<<strong>br</strong> />

1 1 1<<strong>br</strong> />

Corpo N Carga N<<strong>br</strong> />

Tampa<<strong>br</strong> />

N<<strong>br</strong> />

10 g 1 g<<strong>br</strong> />

Aditivo<<strong>br</strong> />

(cor<<strong>br</strong> />

azul)<<strong>br</strong> />

Demanda independente (maior<<strong>br</strong> />

incerteza porque depende de<<strong>br</strong> />

previsao)<<strong>br</strong> />

Fa<strong>br</strong>icante<<strong>br</strong> />

Canetas NIC<<strong>br</strong> />

Demanda dependente<<strong>br</strong> />

(menorincerteza porque depende de<<strong>br</strong> />

calculo)<<strong>br</strong> />

Situacao com coordenacao<<strong>br</strong> />

de sistemas de gestao de<<strong>br</strong> />

estoque<<strong>br</strong> />

Demanda independente<<strong>br</strong> />

(maior incerteza porque<<strong>br</strong> />

depende de previsao)<<strong>br</strong> />

Plastico<<strong>br</strong> />

X<<strong>br</strong> />

Caneta<<strong>br</strong> />

NIC<<strong>br</strong> />

1 1 1<<strong>br</strong> />

Corpo N Carga N<<strong>br</strong> />

Tampa<<strong>br</strong> />

N<<strong>br</strong> />

10 g 1 g<<strong>br</strong> />

Demanda dependente<<strong>br</strong> />

(menorincerteza porque<<strong>br</strong> />

depende de calculo)<<strong>br</strong> />

Aditivo<<strong>br</strong> />

(cor<<strong>br</strong> />

azul)<<strong>br</strong> />

Coordenacao<<strong>br</strong> />

de sistemas<<strong>br</strong> />

Tampa<<strong>br</strong> />

N<<strong>br</strong> />

3 g 0.5 g<<strong>br</strong> />

Plastico<<strong>br</strong> />

Y<<strong>br</strong> />

Aditivo


Kanban é como é chamado o sistema que gerencia<<strong>br</strong> />

os estoques e os fluxos puxados nos sistemas<<strong>br</strong> />

como o Just-inTim e o lean.


Fundicao<<strong>br</strong> />

E<<strong>br</strong> />

E<<strong>br</strong> />

Fornecedor de rotores<<strong>br</strong> />

fundidos <strong>br</strong>utos<<strong>br</strong> />

Fa<strong>br</strong>icante de bombas hidraulicas<<strong>br</strong> />

E<<strong>br</strong> />

E<<strong>br</strong> />

E<<strong>br</strong> />

E<<strong>br</strong> />

Linha<<strong>br</strong> />

Cliente (montadora)


1.<<strong>br</strong> />

2.<<strong>br</strong> />

Por que pode-se dizer que<<strong>br</strong> />

o novo fluxo de materiais<<strong>br</strong> />

na rede de suprimentos de<<strong>br</strong> />

peças so<strong>br</strong>essalentes da<<strong>br</strong> />

GM é<<strong>br</strong> />

puxado?<<strong>br</strong> />

Por que este novo fluxo<<strong>br</strong> />

diminui a chance de<<strong>br</strong> />

ocorrência do chamado<<strong>br</strong> />

éfeito chicote”? Consulte o<<strong>br</strong> />

<strong>Capítulo</strong> 8, refresque sua<<strong>br</strong> />

memória so<strong>br</strong>e as<<strong>br</strong> />

principais causas do efeito<<strong>br</strong> />

chicote e identifique no<<strong>br</strong> />

caso GMB como (e se) cada<<strong>br</strong> />

uma das causas é atacado.


No VMI, em vez de a empresa em questão<<strong>br</strong> />

gerenciar seus estoques de insumos, eles são<<strong>br</strong> />

gerenciados por cada fornecedor. Isso pode<<strong>br</strong> />

fazer sentido em pelo menos duas situações:<<strong>br</strong> />

quando o fornecedor tem mais foco ou mais<<strong>br</strong> />

informações so<strong>br</strong>e a demanda que o cliente.<<strong>br</strong> />

Na consignação, o estoque, mesmo já de<<strong>br</strong> />

posse da empresa cliente, continua de<<strong>br</strong> />

propriedade do fornecedor.


O modelo de ponto de reposição com lote<<strong>br</strong> />

econômico: o período entre pedidos é<<strong>br</strong> />

variável e a quantidade pedida é fixa.<<strong>br</strong> />

Nível<<strong>br</strong> />

de<<strong>br</strong> />

estoque<<strong>br</strong> />

Ponto de<<strong>br</strong> />

ressuprimento<<strong>br</strong> />

Taxa de demanda “d”<<strong>br</strong> />

Tempo de<<strong>br</strong> />

ressuprimento<<strong>br</strong> />

Modelagem simplificadora, assumindo demanda “d” constante<<strong>br</strong> />

Lote de ressuprimento<<strong>br</strong> />

tempo


Cf - custo fixo de fazer um pedido de<<strong>br</strong> />

ressuprimento - é considerado “fixo” pois não varia<<strong>br</strong> />

com a quantidade pedida.<<strong>br</strong> />

Ce - custo unitário anual de estocagem - é o custo<<strong>br</strong> />

anual de armazenagem de uma unidade do item.<<strong>br</strong> />

Custos<<strong>br</strong> />

Custo total de gerir<<strong>br</strong> />

o sistema é maior<<strong>br</strong> />

para qualquer outro<<strong>br</strong> />

tamanho de lote<<strong>br</strong> />

Lote Econômico<<strong>br</strong> />

(Tamanho de lote<<strong>br</strong> />

que minimiza custo<<strong>br</strong> />

total)<<strong>br</strong> />

Custo total<<strong>br</strong> />

Custo de estocar<<strong>br</strong> />

Custo de pedir<<strong>br</strong> />

Tamanho do lote


Nível de<<strong>br</strong> />

estoques<<strong>br</strong> />

Estoque<<strong>br</strong> />

Máximo<<strong>br</strong> />

L1<<strong>br</strong> />

LT<<strong>br</strong> />

Lotes de ressuprimento (variáveis)<<strong>br</strong> />

L2<<strong>br</strong> />

P P P<<strong>br</strong> />

L3 L4<<strong>br</strong> />

R1 R2<<strong>br</strong> />

R3 R4<<strong>br</strong> />

P<<strong>br</strong> />

Períodos de revisão (fixos)<<strong>br</strong> />

Tempo


DRP<<strong>br</strong> />

MPS<<strong>br</strong> />

MRP<<strong>br</strong> />

Venda a<<strong>br</strong> />

Clientes<<strong>br</strong> />

Armazém Armazém de de<<strong>br</strong> />

Uberlândia Uberlândia<<strong>br</strong> />

Fá<strong>br</strong>ica de<<strong>br</strong> />

São Paulo<<strong>br</strong> />

COMPONENTES<<strong>br</strong> />

Venda a<<strong>br</strong> />

Clientes<<strong>br</strong> />

Armazém Armazém de de<<strong>br</strong> />

Porto Curitiba Alegre<<strong>br</strong> />

Venda a<<strong>br</strong> />

Clientes<<strong>br</strong> />

DRP UBERLÂNDIA 1 2 3 4 5 6 7 8<<strong>br</strong> />

Previsão de Vendas 200 200 200 200 200 200 200 200<<strong>br</strong> />

Em Trânsito<<strong>br</strong> />

Estoque Projetado 500 300 500 300 500 300 500 300 500<<strong>br</strong> />

Recebimento Ordens Planejadas 400 400 400 400<<strong>br</strong> />

Liberação de Ordens Planejadas 400 400 400 400<<strong>br</strong> />

Lote 400<<strong>br</strong> />

Lead Time 1<<strong>br</strong> />

Estoque de Segurança 200<<strong>br</strong> />

DRP PORTO ALEGRE 1 2 3 4 5 6 7 8<<strong>br</strong> />

Previsão de Vendas 150 150 150 150 150 150 150 150<<strong>br</strong> />

Em Trânsito 300<<strong>br</strong> />

Estoque Projetado 350 500 350 200 350 200 350 200 350<<strong>br</strong> />

Recebimento Ordens Planejadas 300 300 300<<strong>br</strong> />

Liberação de Ordens Planejadas 300 300 300<<strong>br</strong> />

Lote 300<<strong>br</strong> />

Lead Time 2<<strong>br</strong> />

Estoque de Segurança 200<<strong>br</strong> />

MPS SÃO PAULO 1 2 3 4 5 6 7 8<<strong>br</strong> />

Previsão de Vendas 100 100 100 100 100 100 100 100<<strong>br</strong> />

Necessidades Uberlândia 400 400 400 400<<strong>br</strong> />

Necessidades Porto Alegre 300 300 300<<strong>br</strong> />

Demanda Total 500 400 500 400 500 400 500 100<<strong>br</strong> />

Estoque Projetado 1300 800 400 900 500 1000 600 1100 1000<<strong>br</strong> />

MPS 1000 1000 1000<<strong>br</strong> />

Lote 1000<<strong>br</strong> />

Estoque de Segurança 400


Fá<strong>br</strong>ica<<strong>br</strong> />

Centro de Distribuição<<strong>br</strong> />

Fa<strong>br</strong>icante<<strong>br</strong> />

Atacado<<strong>br</strong> />

Varejo<<strong>br</strong> />

Fluxo tradicional com estoques desbalanceados<<strong>br</strong> />

Fluxo com DRP e estoques balanceados<<strong>br</strong> />

Consumidores


Valor<<strong>br</strong> />

Quantidade Custo Unitario movimentado % %<<strong>br</strong> />

(unidades) (R$) (R$) do total acumulada<<strong>br</strong> />

Item 1 13661 18.3 249996.30 17.7% 17.7%<<strong>br</strong> />

Item 2 40000 5.0 200000.00 14.2% 31.8%<<strong>br</strong> />

Item 3 9816 16.3 160000.80 11.3% 43.2%<<strong>br</strong> />

Item 4 9846 13.0 127998.00 9.1% 52.2%<<strong>br</strong> />

Item 5 4267 24.0 102408.00 7.2% 59.5% Itens "A"<<strong>br</strong> />

Item 6 28248 2.9 81919.20 5.8% 65.3%<<strong>br</strong> />

Item 7 11108 5.9 65537.20 4.6% 69.9%<<strong>br</strong> />

Item 8 4723 11.1 52425.30 3.7% 73.6%<<strong>br</strong> />

Item 9 1143 36.7 41948.10 3.0% 76.6%<<strong>br</strong> />

Item 10 9587 3.5 33554.50 2.4% 79.0%<<strong>br</strong> />

Item 11 2559 11.8 30196.20 2.1% 81.1%<<strong>br</strong> />

Item 12 5033 5.4 27178.20 1.9% 83.0%<<strong>br</strong> />

Item 13 1406 17.4 24464.40 1.7% 84.7%<<strong>br</strong> />

Item 14 2246 9.8 22010.80 1.6% 86.3%<<strong>br</strong> />

Item 15 1366 14.5 19807.00 1.4% 87.7%<<strong>br</strong> />

Item 16 924 19.3 17833.20 1.3% 89.0%<<strong>br</strong> />

Item 17 579 27.7 16038.30 1.1% 90.1% Itens "B"<<strong>br</strong> />

Item 18 1128 12.8 14438.40 1.0% 91.1%<<strong>br</strong> />

Item 19 2063 6.3 12996.90 0.9% 92.0%<<strong>br</strong> />

Item 20 496 23.6 11705.60 0.8% 92.9%<<strong>br</strong> />

Item 21 1170 9.0 10530.00 0.7% 93.6%<<strong>br</strong> />

Item 22 1041 9.1 9473.10 0.7% 94.3%<<strong>br</strong> />

Item 23 565 15.1 8531.50 0.6% 94.9%<<strong>br</strong> />

Item 24 1535 5.0 7675.00 0.5% 95.4%<<strong>br</strong> />

Item 25 698 9.9 6910.20 0.5% 95.9%<<strong>br</strong> />

Item 26 514 12.1 6219.40 0.4% 96.4%<<strong>br</strong> />

Item 27 411 13.6 5589.60 0.4% 96.8%<<strong>br</strong> />

Item 28 165 30.6 5049.00 0.4% 97.1%<<strong>br</strong> />

Item 29 384 11.8 4531.20 0.3% 97.4%<<strong>br</strong> />

Item 30 600 6.8 4080.00 0.3% 97.7%<<strong>br</strong> />

Item 31 274 13.4 3671.60 0.3% 98.0%<<strong>br</strong> />

Item 32 133 24.8 3298.40 0.2% 98.2%<<strong>br</strong> />

Item 33 168 17.7 2973.60 0.2% 98.4%<<strong>br</strong> />

Item 34 148 18.1 2678.80 0.2% 98.6%<<strong>br</strong> />

Item 35 376 6.4 2406.40 0.2% 98.8%<<strong>br</strong> />

Item 36 943 2.3 2168.90 0.2% 98.9% Itens "C"<<strong>br</strong> />

Item 37 123 15.8 1943.40 0.1% 99.1%<<strong>br</strong> />

Item 38 179 9.8 1754.20 0.1% 99.2%<<strong>br</strong> />

Item 39 200 7.9 1580.00 0.1% 99.3%<<strong>br</strong> />

Item 40 71 19.9 1412.90 0.1% 99.4%<<strong>br</strong> />

Item 41 90 14.3 1287.00 0.1% 99.5%<<strong>br</strong> />

Item 42 240 4.8 1152.00 0.1% 99.6%<<strong>br</strong> />

Item 43 113 9.2 1039.60 0.1% 99.7%<<strong>br</strong> />

Item 44 88 10.6 932.80 0.1% 99.7%<<strong>br</strong> />

Item 45 36 23.1 831.60 0.1% 99.8%<<strong>br</strong> />

Item 46 164 4.6 754.40 0.1% 99.8%<<strong>br</strong> />

Item 47 87 7.8 678.60 0.0% 99.9%<<strong>br</strong> />

Item 48 130 4.7 611.00 0.0% 99.9%<<strong>br</strong> />

Item 49 65 8.5 552.50 0.0% 100.0%<<strong>br</strong> />

Item 50 28 17.7 495.60 0.0% 100.0%<<strong>br</strong> />

Total 1413268.70


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Itens A Itens B Itens C


Imagine que você, como consultor da área de supply chain<<strong>br</strong> />

management, recebeu um e-mail do Sr Levy Gerzberg,<<strong>br</strong> />

com este artigo do “Wall Street Journal” anexado. Ele quer<<strong>br</strong> />

contratar você para auxiliar a disparar iniciativas para<<strong>br</strong> />

evitar que as ocorrências narradas no artigo recorram. Ele<<strong>br</strong> />

pede, preliminarmente que você faça uma análise<<strong>br</strong> />

detalhada de situação, identifique as causas do problema<<strong>br</strong> />

e aponte quais seriam, em grandes linhas as mudanças<<strong>br</strong> />

que você sugeriria para estrategicamente prevenir a<<strong>br</strong> />

recorrência do problema.<<strong>br</strong> />

Como você quer exceder a expectativa do contratante,<<strong>br</strong> />

você decide também discutir as principais dificuldades que<<strong>br</strong> />

você enxerga na implantação des mudanças sugeridas em<<strong>br</strong> />

1, justificadamente. Descreva como vecê abordaria esta<<strong>br</strong> />

questão.

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